(c++.distdir): mkdir tmp/cp first.

From-SVN: r7177

gcc/cp/Make-lang.in

@@ -148,6 +148,7 @@ c++.stage4:
 # This target creates the files that can be rebuilt, but go in the
 # distribution anyway.  It then copies the files to the distdir directory.
 c++.distdir:
+	mkdir tmp/cp
 	cd cp ; $(MAKE) $(FLAGS_TO_PASS) $(CXX_FLAGS_TO_PASS) parse.c hash.h
 	cd cp; \
 	for file in *[0-9a-zA-Z+]; do \