Passing modlibs in python3-config

This is so that programs that link libpython3.12 will have correct flags
for libraries that libpython depends on.

Author: roddyrap

Misc/python-config.sh.in

@@ -41,7 +41,7 @@ LIBM="@LIBM@"
 LIBC="@LIBC@"
 SYSLIBS="$LIBM $LIBC"
 ABIFLAGS="@ABIFLAGS@"
-LIBS="@LIBPYTHON@ @LIBS@ $SYSLIBS"
+LIBS="@LIBPYTHON@ @LIBS@ @MODLIBS@ $SYSLIBS"
 LIBS_EMBED="-lpython${VERSION}${ABIFLAGS} @LIBS@ $SYSLIBS"
 BASECFLAGS="@BASECFLAGS@"
 LDLIBRARY="@LDLIBRARY@"