[gimp] app: fix off-root builds

[Nils Philippsen <nphilipp src gnome org>]

commit 7c7c8de1657020bca410c9e5d51098c0d78f2160
Author: Nils Philippsen <nils redhat com>
Date:   Wed May 29 11:22:27 2013 +0200

    app: fix off-root builds
    
    Source file ("unique.c") includes header file from subdirectory
    ("gui/gimpdbusservice.h") which includes generated header file
    ("gimpdbusservice-generated.h").
    
    In off-root builds this file isn't created in the same directory,
    therefore the directory needs to be explicitly added as an include path.

 app/Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/app/Makefile.am b/app/Makefile.am
index 36b6b5d..59d14e0 100644
--- a/app/Makefile.am
+++ b/app/Makefile.am
@@ -114,7 +114,8 @@ INCLUDES = \
        $(GTK_CFLAGS)           \
        $(PANGOCAIRO_CFLAGS)    \
        $(GEGL_CFLAGS)          \
-       -I$(includedir)
+       -I$(includedir)         \
+       -I$(builddir)/gui
 
 # FIXME: core should not depend on xcf
 workaround_that_core_depends_on_xcf = \