pass the install location for locales (datadir) to subdirectories

--- gcc-3.3.3/libstdc++-v3/Makefile.in	2003-07-04 21:53:54.000000000 +0200
+++ gcc-3.3.3/libstdc++-v3/Makefile.in-p	2004-11-04 01:34:50.772314280 +0100
@@ -148,6 +148,8 @@
 MAINT_CHARSET = latin1
 
 SUBDIRS = include libio libmath libsupc++ src po testsuite 
+SUBDIR_FLAGS_TO_PASS = \
+	"datadir=$(datadir)"
 
 mkinstalldirs = $(SHELL) $(toplevel_srcdir)/mkinstalldirs
 
@@ -294,7 +296,7 @@
 	  else \
 	    local_target="$$target"; \
 	  fi; \
-	  (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
+	  (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) $(SUBDIR_FLAGS_TO_PASS) $$local_target) \
 	   || case "$$amf" in *=*) exit 1;; *k*) fail=yes;; *) exit 1;; esac; \
 	done; \
 	if test "$$dot_seen" = "no"; then \