move wx11 and (the rest of) wxMGL specific checks into /chkconf.h file

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40410 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/x11/chkconf.h

@@ -0,0 +1,23 @@
+/*
+ * Name:        wx/x11/chkconf.h
+ * Purpose:     Compiler-specific configuration checking
+ * Author:      Julian Smart
+ * Modified by:
+ * Created:     01/02/97
+ * RCS-ID:      $Id$
+ * Copyright:   (c) Julian Smart
+ * Licence:     wxWindows licence
+ */
+
+/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
+
+#ifndef _WX_X11_CHKCONF_H_
+#define _WX_X11_CHKCONF_H_
+
+
+/* wxPalette is always needed */
+#if !wxUSE_PALETTE
+#   error "wxX11 requires wxUSE_PALETTE=1"
+#endif
+
+#endif /* _WX_X11_CHKCONF_H_ */