[libgdamm] Auto-generate the ChangeLog from the git log for 'make dist'.

[José Alburquerque <jaalburqu src gnome org>]

commit 0ef1b17506168410be06a3aea50a781894e7642b
Author: José Alburquerque <jaalburquerque gmail com>
Date:   Tue Jul 2 18:36:04 2013 -0400

    Auto-generate the ChangeLog from the git log for 'make dist'.
    
        * Makefile.am: Include the dist-changelog.am file copied in build/
        from mm-common so that the ChangeLog is automatically generated from
        the git commit messages on 'make dist'.

 Makefile.am |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 1f30a8f..75c0d88 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -40,3 +40,6 @@ nodist_pkgconfig_DATA = libgda/$(LIBGDAMM_MODULE_NAME).pc
 
 dist_noinst_DATA = COPYING.examples
 dist_noinst_SCRIPTS = autogen.sh
+
+# Optional: auto-generate the ChangeLog file from the git log on make dist
+include $(top_srcdir)/build/dist-changelog.am