fix 'make rpm'

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5868 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile

@@ -727,7 +727,7 @@ spec:
 
 rpm: __rpm
 
-__rpm: _version spec
+__rpm: include/asterisk/version.h spec
 	rm -rf /tmp/asterisk ; \
 	mkdir -p /tmp/asterisk/redhat/RPMS/i386 ; \
 	$(MAKE) DESTDIR=/tmp/asterisk install ; \