[goocanvasmm] --enable-warnings=fatal: Use the same warnings as glibmm and gtkmm.

[Murray Cumming <murrayc src gnome org>]

commit a27a5dff26b6686b9818addcdb817b8d6610100a
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Oct 27 10:55:38 2015 +0100

    --enable-warnings=fatal: Use the same warnings as glibmm and gtkmm.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index fc146db..da79a4b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,7 +64,7 @@ MM_ARG_WITH_TAGFILE_DOC([gtkmm-3.0.tag], [gtkmm-3.0])
 AC_LANG([C++])
 MM_ARG_ENABLE_WARNINGS([GOOCANVASMM_WXXFLAGS],
                        [-Wall],
-                       [-pedantic -Wall -Wextra -Wformat-security-Wno-long-long -DGSEAL_ENABLE],
+                       [-pedantic -Wall -Wextra -Wformat-security -Wsuggest-override -Wshadow 
-Wno-long-long],
                        [G PANGO ATK GDK GDK_PIXBUF GTK SIGC GLIBMM ATKMM PANGOMM CAIROMM GTKMM])
 
 AC_CONFIG_FILES([Makefile