[gnome-photos] build: Really enable strict compiler warnings

[Debarshi Ray <debarshir src gnome org>]

commit 0af588f0831fed9b3c2ca827b6b78b7a03875a90
Author: Emanuele Aina <emanuele aina collabora com>
Date:   Fri Jun 28 11:55:21 2013 +0200

    build: Really enable strict compiler warnings
    
    The GNOME_COMPILE_WARNINGS macro was used but the produced WARN_CFLAGS
    variable was not and no strict warning was enforced.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=703269

 src/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index e095edc..7d21ff6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -230,6 +230,7 @@ AM_CPPFLAGS = \
        $(LIBEXIF_CFLAGS) \
        $(LIBRSVG_CFLAGS) \
        $(TRACKER_CFLAGS) \
+       $(WARN_CFLAGS) \
        -I$(top_srcdir)/libgd \
        $(NULL)