configure & compiler warning cleanup
- configure: Use
LT_INIT
from libtool 2 instead of deprecatedAC_PROG_LIBTOOL
- configure: clear up obsolete macro warnings from autoconf
- Move X.Org's standard C warning flags to
AM_CFLAGS
- Quiet
-Wredundant-decls
fromxorg/os.h
fallbacks for new libc functions