configure & compiler warning cleanup
- configure: Use
LT_INIT
from libtool 2 instead of deprecatedAC_PROG_LIBTOOL
- Add X.Org's standard C warning flags to
AM_CFLAGS
- Quiet
-Wredundant-decls
from xorg/os.h fallbacks for new libc functions - Fix
error: implicit declaration of function 'xf86UnMapVidMem'