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)'".

diff -ru glibc-2.29-old/localedata/Makefile glibc-2.29-new/localedata/Makefile
--- glibc-2.29-old/localedata/Makefile	2019-01-31 11:45:36.000000000 -0500
+++ glibc-2.29-new/localedata/Makefile	2019-07-03 22:48:35.662015071 -0400
@@ -385,7 +385,7 @@
 
 # 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-locale-archive
 
 # Create and install the locale-archive file.
@@ -414,7 +414,7 @@
 	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';
 endef
 
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<div class='path'>path: <a href='/guix/log/?id=7cf06d62bfd0c8a97d33c7ff8e8ba9c9322b2b7a'>root</a>/<a href='/guix/log/tests?id=7cf06d62bfd0c8a97d33c7ff8e8ba9c9322b2b7a'>tests</a>/<a href='/guix/log/tests/crate.scm?id=7cf06d62bfd0c8a97d33c7ff8e8ba9c9322b2b7a'>crate.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/tests/crate.scm?id=7cf06d62bfd0c8a97d33c7ff8e8ba9c9322b2b7a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-02-13 16:04:09 +0100'>2017-02-13</span></td><td><a href='/guix/commit/tests/crate.scm?id=ce8963c5b7a728257920aeceeb89e40d166d09f4'>tests: Adjust for 'http-fetch' change in (guix import json).</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to commit 81e0bc1834490a1a8092c75a0733b15c2b407285.

* tests/cpan.scm ("cpan-&gt;guix-package"): Add a 'rest' argument to the
lambda that mocks 'http-fetch'.
* tests/crate.scm ("crate-&gt;guix-package"): Likewise.
* tests/gem.scm ("gem-&gt;guix-package"): Likewise.
* tests/pypi.scm ("pypi-&gt;guix-package"): Likewise.
("pypi-&gt;guix-package, wheels"): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-01-01 18:20:52 +0100'>2017-01-01</span></td><td><a href='/guix/commit/tests/crate.scm?id=f1d136957d0d5634e60e5389a046a917169cdb9e'>build-system: cargo: Handle Cargo.lock file not present.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build-system/cargo.scm (cargo-build): Add src output.
  (private-keywords): Add #:outputs.
* guix/build/cargo-build-system.scm (configure): Use /share/rust-source
  when replacing inputs.
  (build, check): Don't do anything when there isn't a Cargo.lock file
  present.
  (install): Install sources to src output. When a Cargo.lock file is
  present use cargo install to install binaries to out.
* guix/import/crate.scm (make-crate-sexp): Importer uses the src output
  for crate inputs by default.
* guix/import/utils.scm (package-names-&gt;package-inputs, maybe-inputs,
  maybe-native-inputs): Take an optional output argument.
* tests/crate.scm (crate-&gt;guix-package test): Update.

Problem reported by Francisco Gómez García &lt;espectalll@kydara.com&gt;.
</span></span></td><td>David Craven</td></tr>
<tr><td><span title='2017-01-01 18:12:06 +0100'>2017-01-01</span></td><td><a href='/guix/commit/tests/crate.scm?id=f53a5514e0e9535d2e7c668803e64b4aac17da2b'>import: crate: Provide a default home-page value.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/crate.scm (make-crate-sexp): Provide a default home-page
  value.
* tests/crate.scm (test-crate): Add repository field.

Problem reported by ng0 &lt;ng0@libertad.pw&gt;.
</span></span></td><td>David Craven</td></tr>
<tr><td><span title='2016-12-14 16:30:42 +0100'>2016-12-14</span></td><td><a href='/guix/commit/tests/crate.scm?id=3e0c036584b41bcc08a8c8e040295716108bb0b2'>import: Add importer for rust crates.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/crate.scm: New file.
* guix/scripts/import/crate.scm: New file.
* guix/scripts/import.scm (importers): Add crate importer.
* tests/crate.scm: New file.
* doc/guix.texi: Add crate importer to table.
* Makefile.am (MODULES, SCM_TESTS): Add files.
</span></span></td><td>David Craven</td></tr>