Clean changelogs, but not too often

Makefile.am

@@ -242,7 +242,7 @@ vlc-config.in: vlc-config.in.in
 	touch $@
 
 CLEANFILES = $(BUILT_SOURCES_clean) stamp-builtin
-DISTCLEANFILES = $(BUILT_SOURCES_distclean) vlc-config.in compile
+DISTCLEANFILES = $(BUILT_SOURCES_distclean) vlc-config.in compile ChangeLog
 
 # Shortcut for developpers to rebuild the core (libvlc + vlc)
 # Don't use it if you don't know what it is about.

doc/Makefile.am

@@ -47,6 +47,8 @@ EXTRA_DIST = \
 	demo.sh \
 	$(NULL)
 
+DISTCLEANFILES = $(CHANGELOGS)
+
 $(CHANGELOGS): Makefile.am
 	y="$$(echo "$@" | sed -e 's,ChangeLog-,,')" ; \
 	git-log \