Remove *.da files after profiledbuild finishes. This is not part of the default build. I need this for tinderbox tests so that stale profile data isn't used.

client.mk

@@ -753,6 +753,7 @@ profiledbuild:: $(OBJDIR)/Makefile $(OBJDIR)/config.status
 	OBJDIR=${OBJDIR} $(PROFILE_GEN_SCRIPT)
 	$(MOZ_MAKE) clobber_all
 	$(MOZ_MAKE) MOZ_PROFILE_USE=1
+	find $(OBJDIR) -name "*.da" -exec rm {} \;
 
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 # Other targets