remove more compiler stuff from configure.ac

configure.ac

@@ -5,7 +5,6 @@ AM_INIT_AUTOMAKE([dist-bzip2 foreign no-define tar-pax])
 # are still in use. So don't use them unconditionally.
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
-AC_USE_SYSTEM_EXTENSIONS
 AC_SYS_LARGEFILE
 
 AC_PATH_PROG(MSGFMT, msgfmt, AC_MSG_ERROR(Could not find msgfmt))
@@ -16,10 +15,8 @@ AC_ARG_WITH(debug,
  AS_HELP_STRING([--without-debug],[disable debugging code]),
  [with_debug="$withval"],[with_debug="yes"])
 if test "$with_debug" = "yes"; then
- DEBUG_CFLAGS="-ggdb3"
  AC_DEFINE([DEBUG],[1],[Define to 1 to enable debugging code])
 fi
-AC_SUBST(DEBUG_CFLAGS)
 
 AC_ARG_WITH(po,
  AS_HELP_STRING([--with-po],[enable updating of po files]),