[pygobject] Build with -Werror=format

[Martin Pitt <martinpitt src gnome org>]

commit 5c5b066854cc0b3b7702f31d212aa3f511c62127
Author: Martin Pitt <martinpitt gnome org>
Date:   Tue Jul 31 10:30:22 2012 +0200

    Build with -Werror=format
    
    This catches format string problems on particular architectures like in commit
    dea24f8e12 much more insistently.

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 45408fb..9e79ec5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -227,6 +227,7 @@ if test "x$GCC" = "xyes"; then
   JH_ADD_CFLAG([-Werror=pointer-arith])
   JH_ADD_CFLAG([-Werror=format-security])
   JH_ADD_CFLAG([-Werror=missing-include-dirs])
+  JH_ADD_CFLAG([-Werror=format])
   JH_ADD_CFLAG([-fno-strict-aliasing])
 
   case $host_os in