[f-spot] Also update Makefile.am

[Stephen Shaw <sshaw src gnome org>]

commit 96f669ebeadde498bb42437eb752fa314b4d907f
Author: Stephen Shaw <sshaw decriptor com>
Date:   Mon May 13 23:38:11 2013 -0600

    Also update Makefile.am

 Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 1de2b23..b242a46 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,6 +2,7 @@ SUBDIRS =               \
        build           \
        data            \
        lib             \
+       external        \
        docs            \
        help            \
        icons           \