[gitg] add -I libgd to ACLOCAL_AMFLAGS

[Ignacio Casal Quinteiro <icq src gnome org>]

commit abf0c6da9e7a8f8846f625f1d05ceee585b62890
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Thu Feb 14 11:29:00 2013 +0100

    add -I libgd to ACLOCAL_AMFLAGS

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index b706133..32adbe7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 ## Process this file with automake to produce Makefile.in
 
-ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+ACLOCAL_AMFLAGS = -I m4 -I libgd ${ACLOCAL_FLAGS}
 
 SUBDIRS = libgitg libgitg-gtk libgitg-ext plugins gitg data po tests