This patch allows us to use glibc's build system to build locales
in a package separate from glibc.

  1. Use 'localedef' from $PATH since we are not rebuilding it.
  2. Use '--no-archive' to avoid building the big locale archive, and
     because the already-built 'localedef' would want to write it
     to '/run/current-system/locale', which is not possible.
  3. Pass $(localedir)/$$locale to install files in the right place, and
     because otherwise, 'localedef' fails with:
     "cannot write output files to `(null)'".

--- glibc-2.22/localedata/Makefile	1970-01-01 01:00:00.000000000 +0100
+++ glibc-2.22/localedata/Makefile	2015-09-25 14:18:34.698941752 +0200
@@ -195,7 +195,7 @@ INSTALL-SUPPORTED-LOCALES=$(addprefix in
 
 # Sometimes the whole collection of locale files should be installed.
 LOCALEDEF=I18NPATH=. GCONV_PATH=$(common-objpfx)iconvdata LC_ALL=C \
-$(rtld-prefix) $(common-objpfx)locale/localedef
+  localedef --no-archive
 install-locales: $(INSTALL-SUPPORTED-LOCALES)
 
 install-locales-dir:
@@ -212,7 +212,7 @@ $(INSTALL-SUPPORTED-LOCALES): install-lo
 	input=`echo $$locale | sed 's/\([^.]*\)[^@]*\(.*\)/\1\2/'`; \
 	$(LOCALEDEF) --alias-file=../intl/locale.alias \
 		     -i locales/$$input -c -f charmaps/$$charset \
-		     $(addprefix --prefix=,$(install_root)) $$locale \
+		     $(addprefix --prefix=,$(install_root)) $(localedir)/$$locale \
 	&& echo ' done'; \
 
 tst-setlocale-ENV = LC_ALL=ja_JP.EUC-JP
