Specify linker flags to resolve issue with PyPy and latest distutils

.gitignore

@@ -74,6 +74,7 @@ console/
 # Virtual environments
 venv
 p3*/
+pypy*/
 
 # Installer logs
 pip-log.txt

src/islenska/bin_build.py

@@ -37,6 +37,7 @@
 
 from typing import cast, Any
 
+import os
 import platform
 import cffi  # type: ignore
 
@@ -72,6 +73,10 @@
 if MACOS:
     extra_link_args = ["-stdlib=libc++", "-mmacosx-version-min=10.9"]
 
+# On some systems, the linker needs to be told to use the C++ compiler
+# due to changes in the default behaviour of distutils
+os.environ["LDCXXSHARED"] = "c++ -shared"
+
 ffibuilder.cdef(declarations)  # type: ignore
 
 ffibuilder.set_source(  # type: ignore