Bug#847596: locales-all non-deterministically generates either kk_KZ.PT154 or kk_KZ.RK1048 despite declaring support for both

[Ximin Luo]

Package: locales-all
Version: 2.24-7
Severity: normal

Dear Maintainer,

The build of locales-all sometimes generates kk_KZ.PT154 (about 1/6 of the
time) and sometimes generates kk_KZ.RK1048 (about 5/6 of the time), even though
it declares support for both. Note also that RK1048 is patched in, via
debian/patches/localedata/supported.diff. You can find my test files here:

https://people.debian.org/~infinity0/res/debrepro/

Some of them are attached, for your convenience.

To build these, I applied glibc.debdiff to 2.24-7 then ran `debrepro` on the
unpacked source tree. Note they are reproducible except for locales-all. Note
also that `debrepro` does not reliably reproduce this unreproducibility, you
have to run it a few times to see it. I ran it 3 times, for a total of 6
builds, before I saw this. Then:

$ sudo dpkg -i first/libc6_2.24-7.1_amd64.deb
[..]
$ sudo dpkg -i first/libc-bin_2.24-7.1_amd64.deb
[..]
$ sudo dpkg -i first/libc-l10n_2.24-7.1_all.deb
[..]
$ sudo dpkg -i first/locales_2.24-7.1_all.deb
[..]

$ sudo dpkg -i first/locales-all_2.24-7.1_amd64.deb
[..]
$ python3 ./localetest.py 
** error trying to set locale to kk_KZ.PT154
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory

$ sudo dpkg -i second/locales-all_2.24-7.1_amd64.deb 
[..]
$ python3 ./localetest.py
** error trying to set locale to kk_KZ.RK1048
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (300, 'unstable'), (200, 'experimental'), (1, 'experimental-debug')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
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