Solaris versus our NLS files

I idly tried the NLS-testing patch at [1] on a Solaris image
(actually OpenIndiana), and was not really astonished to find that
it fails. Everything compiles cleanly, but the test shows that no
message translation happens, and manual checking confirms that.

After some quality time with Google, I learned why: with Solaris's
apparently-locally-hacked version of gettext, it's not good enough
to have $INSTALLATION/share/locale/ subdirectories named like
"es", "fr", etc. They have to be named after the
fully-spelled-out locale names like "es_ES.UTF-8".

At least Solaris is kind enough to let you do that with
symlinks [2], so that after

cd $INSTALLATION/share/locale
ln -s es es_ES.UTF-8

translation starts working for that particular value of
lc_messages.

This policy dictates making a rather large number of symlinks
in that directory, which we've never done TTBOMK. It's a
bit sad that nobody has complained about this --- one must
conclude that the non-anglophone population of Solaris PG
users is nearly empty.

Anybody feel like doing something about this? I'm not
super excited about it myself, but if we don't, it's
probably a blocker for adding the test proposed at [1].
We do have Solaris BF animals that would start failing.

regards, tom lane

[1] https://www.postgresql.org/message-id/247596.1765300108%40sss.pgh.pa.us
[2] https://docs.oracle.com/cd/E36784_01/html/E39536/gnkbn.html