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 $(inst_complocaledir)/$$locale to install files in the right
     place, and because otherwise, 'localedef' fails with:
     "cannot write output files to `(null)'".

--- glibc-2.27/localedata/Makefile
+++ glibc-2.27/localedata/Makefile
@@ -199,7 +199,7 @@ INSTALL-SUPPORTED-LOCALES=$(addprefix install-, $(SUPPORTED-LOCALES))
 
 # 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:
@@ -224,7 +224,7 @@ $(INSTALL-SUPPORTED-LOCALES): install-locales-dir
 	input=`echo $$locale | sed 's/\([^.]*\)[^@]*\(.*\)/\1\2/'`; \
 	$(LOCALEDEF) $$flags --alias-file=../intl/locale.alias \
 		     -i locales/$$input -f charmaps/$$charset \
-		     $(addprefix --prefix=,$(install_root)) $$locale \
+		     $(addprefix --prefix=,$(install_root)) $(inst_complocaledir)/$$locale \
 	&& echo ' done'; \
 
 tst-setlocale-ENV = LC_ALL=ja_JP.EUC-JP
f='/guix/diff/gnu/services/sound.scm?id=c2e85d02658a3a5e5dd6d296377f382dbe4718d7'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/sound.scm'>
<input type='hidden' name='id' value='c2e85d02658a3a5e5dd6d296377f382dbe4718d7'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=c2e85d02658a3a5e5dd6d296377f382dbe4718d7'>root</a>/<a href='/guix/log/gnu?id=c2e85d02658a3a5e5dd6d296377f382dbe4718d7'>gnu</a>/<a href='/guix/log/gnu/services?id=c2e85d02658a3a5e5dd6d296377f382dbe4718d7'>services</a>/<a href='/guix/log/gnu/services/sound.scm?id=c2e85d02658a3a5e5dd6d296377f382dbe4718d7'>sound.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/sound.scm?id=c2e85d02658a3a5e5dd6d296377f382dbe4718d7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-06-25 23:29:46 +0800'>2018-06-25</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=1e3861eb00a2e9531bc4326b37a31405e34cc0ff'>services: alsa-service-type: Fix the loading of 'pulse' plugin.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2018-05-02 15:11:13 +0300'>2018-05-02</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=8cd1e8e84926dc6ed1012a17609dea2d20ac41b4'>gnu: Add sound service.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>