iputils: move from suid-bit to capabilities, see commit msg

Note that recently pkgmk & pkgutils did not preserved packages xattrs.
This was fixed by pkgutils#455cde3 and pkgmk#cd35b68 commits.

Update pkgutils and pkgmk, check that your /etc/pkgmk.conf has the
following line:

	PKGMK_ARCHIVE_FORMAT="pax"

Hint: use rejmerge to alterate your /etc/pkgmk.conf file!

Finally, rebuild this (iputils) package if needed.

iputils/.footprint

@@ -1,5 +1,5 @@
 drwxr-xr-x	root/root	bin/
--rwsr-xr-x	root/root	bin/ping
+-rwxr-xr-x	root/root	bin/ping
 drwxr-xr-x	root/root	sbin/
 -rwxr-xr-x	root/root	sbin/arping
 drwxr-xr-x	root/root	usr/

iputils/Pkgfile

@@ -4,7 +4,7 @@
 
 name=iputils
 version=20240905
-release=1
+release=2
 source="https://github.com/$name/$name/archive/$version/$name-$version.tar.gz
 	https://archive.archlinux.org/packages/i/$name/$name-$version-1-x86_64.pkg.tar.zst"
 
@@ -16,17 +16,20 @@ build() {
 		-D b_pie=true             \
 		-D BUILD_MANS=false       \
 		-D USE_GETTEXT=false      \
+		-D USE_CAP=true           \
 
 	ninja -C build -j ${JOBS:-1} -v
 	#DESTDIR=$PKG ninja -C build install
 
-	install -m 755 -D build/ping/ping  $PKG/bin/ping
-	install -m 755 -D build/arping     $PKG/sbin/arping
-	install -m 755 -D build/tracepath  $PKG/usr/sbin/tracepath
-	install -m 755 -D build/clockdiff  $PKG/usr/sbin/clockdiff
+	install -m 0755 -D build/ping/ping  $PKG/bin/ping
+	install -m 0755 -D build/arping     $PKG/sbin/arping
+	install -m 0755 -D build/tracepath  $PKG/usr/sbin/tracepath
+	install -m 0755 -D build/clockdiff  $PKG/usr/sbin/clockdiff
 
-	install -m 644 -Dt $PKG/usr/share/man/man8/ \
+	install -m 0644 -Dt $PKG/usr/share/man/man8/ \
 		$SRC/usr/share/man/man8/*
 
-	chmod u+s $PKG/bin/ping
+	# cap_net_admin is needed for ping -m even on ICMP datagram socket
+	# (or cap_net_raw since Linux kernel 5.17).
+	setcap cap_net_admin,cap_net_raw+p $PKG/bin/ping
 }