[gimp] app: Fix compiliation if gexiv2/gexiv2.h is not in the default include path.

[Michael Henning <mhenning src gnome org>]

commit e4260434b6f60a9794024a57239698ab47ecf199
Author: Shlomi Fish <shlomif shlomifish org>
Date:   Tue Dec 24 11:44:57 2013 -0500

    app: Fix compiliation if gexiv2/gexiv2.h is not in the default include path.

 app/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/app/Makefile.am b/app/Makefile.am
index 2f9e9b5..f506f08 100644
--- a/app/Makefile.am
+++ b/app/Makefile.am
@@ -112,6 +112,7 @@ AM_CPPFLAGS = \
        $(GTK_CFLAGS)                   \
        $(PANGOCAIRO_CFLAGS)            \
        $(GEGL_CFLAGS)                  \
+       $(GEXIV2_CFLAGS)                \
        -I$(includedir)                 \
        -I$(builddir)/gui