DOESN'T IMPACT SEAMONKEY since it's inside

!ifdef JDIRS.

a=leaf
r=leaf
author=Steven Green <steven@surfcast.com>

bug: http://bugzilla.mozilla.org/show_bug.cgi?id=34614

Make it so clobber_all, as well as clobber: causes java .class files
in packages defined in JDIRS to be deleted.

config/rules.mak

@@ -282,7 +282,7 @@ $(JDIRS)::
 
 !endif # NO_CAFE
 
-clobber::
+clobber clobber_all::
     -for %g in ($(JDIRS)) do $(RM_R) $(XPDIST:/=\)/classes/%g
 
 !endif # JAVA_OR_NSJVM