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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<tr><td><span title='2020-01-23 09:00:49 +0100'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=6e5fc6c7efe0d3a8465e419bfd2883c64ec0e509'>gnu: mes: Update to 0.22.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-12-07 19:30:36 +0100'>2019-12-07</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=4e23d65056fff3953404693a83f090cb54e02600'>gnu: Add mes-rb5.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-12-07 19:30:04 +0100'>2019-12-07</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=8c0dcf3e89e0eb2a6094263efdbc5eaec0e8e9e8'>gnu: mes: Add patch to remove store name from binary.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-11-25 14:33:27 +0100'>2019-11-25</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=2baed6429148d384b4acb1c2ba152032e648f1f9'>gnu: mes: Update to 0.21.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-11-14 16:41:55 +0100'>2019-11-14</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=99b340f5eeb742d966dd16b1bfd7d2b308edc75f'>gnu: Add m2-planet.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-10-12 12:25:08 +0200'>2019-10-12</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=81a4ca08f7716c730c75ebb2911cf0f5f57dfd3c'>gnu: mescc-tools: Use 'git-fetch'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-29 17:47:18 +0200'>2019-09-29</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=bffd8fcd31e5aa839c64d5e47943c5d8389a0def'>bootstrap: mes: Add mes-0.19.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-09-29 17:47:18 +0200'>2019-09-29</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=066cb9bab262ce2ed70b265477a91bbe2325254e'>bootstrap: mescc-tools: Use mescc-tools-0.5.2, mescc-tools.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-09-17 16:27:15 +0200'>2019-09-17</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=9ff87bb99614923fa3336ab4bbf22e3444709b48'>Merge branch 'master' into core-updates</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-09 22:57:27 +0200'>2019-09-09</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=0b95b19b1d3b525993e79c0c33bdac6b2469c8d4'>gnu: mes: Update to 0.20.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-09-09 22:57:27 +0200'>2019-09-09</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=9aed1de3e90cd17f926b4c46df007c1869b10c3f'>gnu: mescc-tools: Update to 0.6.1.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-09-09 22:57:26 +0200'>2019-09-09</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=86c3a506462f941a3590594bcf1e406e57012faa'>gnu: nyacc: Update to 0.99.0.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>