Update changelog rules to 2012

Makefile.am

@@ -89,7 +89,7 @@ AUTOMAKE_OPTIONS = \
 ChangeLog: Makefile.am
 	rm -f -- "$@"
 	cd doc && $(MAKE) $(AM_MAKEFLAGS) changelogs
-	$(LN_S) -f doc/ChangeLog-2009 "$@"
+	$(LN_S) -f doc/ChangeLog-2012 "$@"
 
 ###############################################################################
 # Mac OS X project

doc/Makefile.am

@@ -81,7 +81,7 @@ $(CHANGELOGS): Makefile.am
 	fi
 
 # This one needs to be rebuilt all the time :)
-.PHONY: ChangeLog-2011 changelogs doc
+.PHONY: ChangeLog-2012 changelogs doc
 
 changelogs: $(CHANGELOGS)