[gnome-software] Enable the stack protection in local builds

[Richard Hughes <rhughes src gnome org>]

commit eca9e31003c3fae774fb76e1bed8792a96311459
Author: Richard Hughes <richard hughsie com>
Date:   Wed Nov 23 11:51:08 2016 +0000

    Enable the stack protection in local builds
    
    This means we crash just the same way as the distro packages.

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 926ac63..9251152 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,6 +23,8 @@ dnl ---------------------------------------------------------------------------
 dnl - Extra verbose warning switches
 dnl ---------------------------------------------------------------------------
 WARN_CFLAGS_EXTRA="
+       -D_FORTIFY_SOURCE=2
+       -fstack-protector-strong
        -Waggregate-return
        -Warray-bounds
        -Wcast-align