Removed -ansi gcc option from autotools

configure.ac

 [
 	AX_CHECK_CFLAGS([-O2])
 	AX_CHECK_CFLAGS([-std=c99 -pedantic])
-	AX_CHECK_CFLAGS([-ansi])
 	AX_CHECK_CFLAGS([-Wall -Werror])
 	AX_CHECK_CFLAGS([-fgnu89-inline])
 ])