[clutter-gtkmm] Use the same --enable-warnings=fatal warnings as gktmm.

[Murray Cumming <murrayc src gnome org>]

commit 0cfc68f3c1e363c82c13d9d7e3460e0986f7a49e
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Feb 24 20:40:22 2016 +0100

    Use the same --enable-warnings=fatal warnings as gktmm.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 90d4982..f06c4ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -62,8 +62,8 @@ MM_ARG_WITH_TAGFILE_DOC([cluttermm-1.0.tag], [cluttermm-1.0])
 AC_LANG([C++])
 MM_ARG_ENABLE_WARNINGS([CLUTTER_GTKMM_WXXFLAGS],
                        [-Wall],
-                       [-Wall -Wextra],
-                       [G PANGO])
+                       [-pedantic -Wall -Wextra -Wformat-security -Wshadow -Wsuggest-override -Wno-long-long 
-DGSEAL_ENABLE],
+                       [G PANGO ATK GDK GDK_PIXBUF GTK GLIBMM ATKMM PANGOMM CAIROMM SIGCXX])
 
 AC_CONFIG_FILES([Makefile
                  codegen/Makefile