Revert "Enable the stack protection in local builds"
Revert "Enable the stack protection in local builds"

This made it difficult to do local debug builds with -O0, causing make
to emit hundreds of:

warning: #warning _FORTIFY_SOURCE requires compiling with optimization

This reverts commit d156942f23b80137740c0781a14a9f05f5fe497c.

ximion/appstream-glib,ximion/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib,ximion/appstream-glib