[libgda] Add -Wformat-security to the --enable-warnings=fatal warnings.

[Murray Cumming <murrayc src gnome org>]

commit 0c416bc2f2b0405f4e9124423d16d05255acf9e5
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Jul 5 09:09:47 2011 +0200

    Add -Wformat-security to the --enable-warnings=fatal warnings.
    
    This did not show any new problems.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0e0924d..aef0996 100644
--- a/configure.ac
+++ b/configure.ac
@@ -807,7 +807,7 @@ AM_CONDITIONAL(DEFAULT_BINARY, test "x$enable_default_binary" = xyes)
 # has problems but we do not want to patch that code.
 DK_ARG_ENABLE_WARNINGS([COREDEPS_WFLAGS],
 	[-Wall],
-	[-Wall -Wextra -Wno-address -Wno-unused-variable -Wno-unused-parameter -Wno-pointer-sign],
+	[-Wall -Wextra -Wformat-security -Wno-address -Wno-unused-variable -Wno-unused-parameter -Wno-pointer-sign],
 	[PANGO G GDK GDK_PIXBUF GTK])
 
 AC_SUBST(COREDEPS_CFLAGS)