[gnome-builder/document-manager] build: add gb-pango.{c,h} to build

[Christian Hergert <chergert src gnome org>]

commit 79597cacb874c45f5cab9cf619fdc5c469c0aec6
Author: Christian Hergert <christian hergert me>
Date:   Wed Dec 10 14:37:01 2014 -0800

    build: add gb-pango.{c,h} to build

 src/gnome-builder.mk |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/gnome-builder.mk b/src/gnome-builder.mk
index f92d9e5..5203e06 100644
--- a/src/gnome-builder.mk
+++ b/src/gnome-builder.mk
@@ -189,6 +189,8 @@ libgnome_builder_la_SOURCES = \
        src/util/gb-glib.h \
        src/util/gb-gtk.c \
        src/util/gb-gtk.h \
+       src/util/gb-pango.c \
+       src/util/gb-pango.h \
        src/util/gb-rgba.c \
        src/util/gb-rgba.h \
        src/util/gb-string.h \