[goobox] configure: added other warnings when --enable-debug is used

[Paolo Bacchilega <paobac src gnome org>]

commit afe96faad6e4cfde4a5a948682e904ef074a2304
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Tue Apr 14 18:03:03 2015 +0200

    configure: added other warnings when --enable-debug is used

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a57773c..dda5e74 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,7 +64,7 @@ fi
 dnl ===========================================================================
 
 if test x$ENABLE_DEBUG = xyes; then
-       WARN_CFLAGS="-Wall -Wcast-align -Wtype-limits -Wclobbered -Wempty-body -Wignored-qualifiers 
-Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wno-sign-compare"
+       WARN_CFLAGS="-Wall -Wcast-align -Wtype-limits -Wclobbered -Wempty-body -Wignored-qualifiers 
-Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wno-sign-compare -Wformat-security"
 else
        WARN_CFLAGS="-Wall"
 fi