configure & compiler warning cleanup
- configure: Use
LT_INITfrom libtool 2 instead of deprecatedAC_PROG_LIBTOOL - Add X.Org's standard C warning flags to
AM_CFLAGS - Handle 2
-Wmissing-prototypeswarnings - Fix
-Wunused-variablewarning
LT_INIT from libtool 2 instead of deprecated AC_PROG_LIBTOOL
AM_CFLAGS
-Wmissing-prototypes warnings-Wunused-variable warning