Solaris: fix compilation warnings

[wiggin15]

Fix some compilation warnings on Solaris.

Output of python setup.py develop prior to fixes:

running develop
running egg_info
writing requirements to psutil.egg-info/requires.txt
writing psutil.egg-info/PKG-INFO
writing top-level names to psutil.egg-info/top_level.txt
writing dependency_links to psutil.egg-info/dependency_links.txt
reading manifest file 'psutil.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'psutil.egg-info/SOURCES.txt'
running build_ext
building 'psutil._psutil_sunos' extension
gcc -fno-strict-aliasing -I/root/python/include -m64 -I/root/python/include/gnutls -I/root/python/include/graphviz -I/root/python/include/libexslt -I/root/python/include/libxml2 -I/root/python/include/libxslt -I/root/python/include/ncurses -I/root/python/include/openssl -I/root/python/include/readline -I/root/python/include/sasl -I/root/python/lib64/libffi-3.2.1/include -DNDEBUG -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -m64 -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=532 -DPSUTIL_SUNOS=1 -DPSUTIL_SUNOS10=1 -I/root/python/include/python2.7 -c psutil/_psutil_common.c -o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_common.o
gcc -fno-strict-aliasing -I/root/python/include -m64 -I/root/python/include/gnutls -I/root/python/include/graphviz -I/root/python/include/libexslt -I/root/python/include/libxml2 -I/root/python/include/libxslt -I/root/python/include/ncurses -I/root/python/include/openssl -I/root/python/include/readline -I/root/python/include/sasl -I/root/python/lib64/libffi-3.2.1/include -DNDEBUG -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -m64 -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=532 -DPSUTIL_SUNOS=1 -DPSUTIL_SUNOS10=1 -I/root/python/include/python2.7 -c psutil/_psutil_posix.c -o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_posix.o
gcc -fno-strict-aliasing -I/root/python/include -m64 -I/root/python/include/gnutls -I/root/python/include/graphviz -I/root/python/include/libexslt -I/root/python/include/libxml2 -I/root/python/include/libxslt -I/root/python/include/ncurses -I/root/python/include/openssl -I/root/python/include/readline -I/root/python/include/sasl -I/root/python/lib64/libffi-3.2.1/include -DNDEBUG -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -m64 -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=532 -DPSUTIL_SUNOS=1 -DPSUTIL_SUNOS10=1 -I/root/python/include/python2.7 -c psutil/_psutil_sunos.c -o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_sunos.o
psutil/_psutil_sunos.c:17:1: warning: multi-line comment [-Wcomment]
 // Because LEGACY_MIB_SIZE defined in the same file there is no way to make autoconfiguration =\
 ^
psutil/_psutil_sunos.c: In function ‘psutil_proc_cpu_num’:
psutil/_psutil_sunos.c:331:12: warning: comparison between pointer and integer
     if (fd != NULL)
            ^
psutil/_psutil_sunos.c: In function ‘psutil_proc_memory_maps’:
psutil/_psutil_sunos.c:838:17: warning: format ‘%c’ expects a matching ‘int’ argument [-Wformat=]
                 p->pr_mflags & MA_SHARED ? 's' : '-');
                 ^
psutil/_psutil_sunos.c:838:17: warning: format ‘%c’ expects a matching ‘int’ argument [-Wformat=]
In file included from /root/python/include/python2.7/Python.h:80:0,
                 from psutil/_psutil_sunos.c:23:
psutil/_psutil_sunos.c: In function ‘psutil_proc_name_and_args’:
/root/python/include/python2.7/object.h:823:32: warning: ‘py_args’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 #define Py_XDECREF(op) do { if ((op) == NULL) ; else Py_DECREF(op); } while (0)
                                ^
psutil/_psutil_sunos.c:130:15: note: ‘py_args’ was declared here
     PyObject *py_args;
               ^
gcc -fno-strict-aliasing -I/root/python/include -m64 -I/root/python/include/gnutls -I/root/python/include/graphviz -I/root/python/include/libexslt -I/root/python/include/libxml2 -I/root/python/include/libxslt -I/root/python/include/ncurses -I/root/python/include/openssl -I/root/python/include/readline -I/root/python/include/sasl -I/root/python/lib64/libffi-3.2.1/include -DNDEBUG -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -m64 -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=532 -DPSUTIL_SUNOS=1 -DPSUTIL_SUNOS10=1 -I/root/python/include/python2.7 -c psutil/arch/solaris/v10/ifaddrs.c -o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/arch/solaris/v10/ifaddrs.o
gcc -fno-strict-aliasing -I/root/python/include -m64 -I/root/python/include/gnutls -I/root/python/include/graphviz -I/root/python/include/libexslt -I/root/python/include/libxml2 -I/root/python/include/libxslt -I/root/python/include/ncurses -I/root/python/include/openssl -I/root/python/include/readline -I/root/python/include/sasl -I/root/python/lib64/libffi-3.2.1/include -DNDEBUG -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -m64 -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=532 -DPSUTIL_SUNOS=1 -DPSUTIL_SUNOS10=1 -I/root/python/include/python2.7 -c psutil/arch/solaris/environ.c -o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/arch/solaris/environ.o
gcc -shared -m64 -L/root/python/lib64 -Wl,-rpath,$ORIGIN,-rpath,$ORIGIN/../lib64 -Wl,-rpath,$ORIGIN/../..,-rpath,$ORIGIN/../../../.. -L/root/python/lib64/engines -L/root/python/lib64/gettext -L/root/python/lib64/graphviz -L/root/python/lib64/libxslt-plugins -L/root/python/lib64/pkgconfig -L/root/python/lib64/python2.7 -L/root/python/lib64/sasl2 build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_common.o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_posix.o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_sunos.o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/arch/solaris/v10/ifaddrs.o build/temp.solaris-2.10-i86pc.64bit-2.7/psutil/arch/solaris/environ.o -L/root/python/lib64 -lkstat -lnsl -lsocket -lpython2.7 -o build/lib.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_sunos.so
copying build/lib.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_sunos.so -> psutil
copying build/lib.solaris-2.10-i86pc.64bit-2.7/psutil/_psutil_posix.so -> psutil
Creating /root/python/lib64/python2.7/site-packages/psutil.egg-link (link to .)
psutil 5.3.2 is already the active version in easy-install.pth

Installed /root/psutil
Processing dependencies for psutil==5.3.2
Finished processing dependencies for psutil==5.3.2

[giampaolo]

Great, thanks. Next time please also feel free to update HISTORY.rst. Merging.