Remove hardcoded -O2

Index: configure
--- configure.orig
+++ configure
@@ -158,8 +158,6 @@ done
 if test -z "$CFLAGS";then
 	if test "$cf_debug" = yes;then
 		CFLAGS_ADD=`fc_add_string "$CFLAGS_ADD" "-g"`
-	else
-		CFLAGS_ADD=`fc_add_string "$CFLAGS_ADD" "-O2"`
 	fi
 fi
 
