GTK_NO_CHECK_CASTS is a gtk1 only thing, so don't put it to CPPFLAGS with gtk2.

It's been renamed to G_NO_CHECK_CASTS in gtk2 stack, but we don't appear to need it.
Why do we need to supress cast checks for gtk1?


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36893 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure.in

@@ -5079,7 +5079,9 @@ if test "$wxUSE_DEBUG_FLAG" = "yes" ; then
     WXCONFIG_CPPFLAGS="$WXCONFIG_CPPFLAGS -D__WXDEBUG__"
 else
     if test "$wxUSE_GTK" = 1 ; then
-        CPPFLAGS="-DGTK_NO_CHECK_CASTS $CPPFLAGS"
+        if test "x$wxGTK_VERSION" = "x1" ; then
+            CPPFLAGS="-DGTK_NO_CHECK_CASTS $CPPFLAGS"
+        fi
     fi
 fi