[gitg] Fix sources for generating docs

[Jesse van den Kieboom <jessevdk src gnome org>]

commit d0e38aa4ecb6a9a6fa3cca280118be1f58514700
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Fri Jan 3 22:06:51 2014 +0100

    Fix sources for generating docs

 libgitg-ext/Makefile.am |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgitg-ext/Makefile.am b/libgitg-ext/Makefile.am
index 64d332e..9d61e9e 100644
--- a/libgitg-ext/Makefile.am
+++ b/libgitg-ext/Makefile.am
@@ -65,7 +65,7 @@ vapidir = $(prefix)/share/vala/vapi
 vapi_DATA = libgitg-ext-1.0.vapi
 
 if ENABLE_DOCS
-docs: $(VALA_FILES)
+docs: $(libgitg_ext_1_0_la_VALASOURCES)
        $(VALADOC)                              \
        --directory $(top_builddir)/docs        \
        --package-name gitgext                  \
@@ -73,7 +73,7 @@ docs: $(VALA_FILES)
        --basedir $(top_srcdir)                 \
        --vapidir $(top_srcdir)/vapi            \
        --vapidir $(top_builddir)/libgitg       \
-       $(VALA_FILES)
+       $(libgitg_ext_1_0_la_VALASOURCES)
 else
 docs:
 endif