this should be cleared out too

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15741 d0543943-73ff-0310-b7d9-9358b9ac24b2

configure.in

@@ -262,6 +262,7 @@ AC_ARG_ENABLE(debug,
 if test "${enable_debug}" = "yes"; then
         AC_DEFINE([DEBUG],[],[Enable extra debugging.])
 	saved_CFLAGS=$CFLAGS
+	CFLAGS=
         AX_CFLAGS_WARN_ALL_ANSI
 	APR_ADDTO(SWITCH_AM_CFLAGS, $CFLAGS)
 	CFLAGS=$saved_CFLAGS