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

[Murray Cumming <murrayc src gnome org>]

commit 52eb5216a89a0805a46cba39450d633b2c7ca4d4
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Oct 27 09:56:45 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 2ef998a..d9a9add 100644
--- a/configure.ac
+++ b/configure.ac
@@ -63,7 +63,7 @@ MM_ARG_WITH_TAGFILE_DOC([cairomm-1.0.tag], [cairomm-1.0])
 AC_LANG([C++])
 MM_ARG_ENABLE_WARNINGS([PANGOMM_WXXFLAGS],
                        [-Wall],
-                       [-pedantic -Wall -Wextra -Wno-long-long -DGSEAL_ENABLE],
+                       [-pedantic -Wall -Wextra -Wformat-security -Wsuggest-override -Wshadow 
-Wno-long-long],
                        [G PANGO GLIBMM])
 
 AC_CONFIG_FILES([Makefile