Only use -Wall etc for GCC

I doubt some other compiler (ICC?) would work with this, but meh...


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@888 726aef4b-f618-498e-8847-2d620e286838

configure.in

@@ -88,8 +88,6 @@ AC_ARG_ENABLE( [sasl],
 	AC_HELP_STRING([--enable-sasl], [enable sasl]),
 	[if test "$enableval" = "yes" ; then SASL=1; fi],)
 
-appendCXX -Wall -W -Wno-unused
-
 if test "$DEBUG" != "no"; then
 	appendCXX -ggdb -D_DEBUG
 else
@@ -101,7 +99,7 @@ if test "$IPV6" != "no"; then
 fi
 
 if test "x$GXX" = "xyes"; then
-	appendCXX -Woverloaded-virtual
+	appendCXX -Wall -W -Wno-unused -Woverloaded-virtual
 	# enable g++ dependency tracking
 	DEPEND=".depend"
 fi