[empathy] Fix distcheck

[Emilio Pozuelo Monfort <epm src gnome org>]

commit ae51279486457b96bb746799fbb79b3e4b8518e6
Author: Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
Date:   Tue Feb 1 14:51:06 2011 +0000

    Fix distcheck

 extensions/Makefile.am |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/extensions/Makefile.am b/extensions/Makefile.am
index 0d540f5..5da2fc4 100644
--- a/extensions/Makefile.am
+++ b/extensions/Makefile.am
@@ -55,6 +55,9 @@ BUILT_SOURCES = \
 
 CLEANFILES = $(BUILT_SOURCES)
 
+clean-local:
+	rm -rf _gen
+
 XSLTPROCFLAGS = --nonet --novalid
 
 # Generated files which can be generated for all categories simultaneously