configure & compiler warning cleanups
- configure: Use
LT_INIT
from libtool 2 instead of deprecatedAC_PROG_LIBTOOL
- Add X.Org's standard C warning flags to
AM_CFLAGS
- Quiet
warning: redundant redeclaration of ‘timingsafe_memcmp’
- Fix 3
-Wmissing-prototypes
warnings intdfx_driver.c