pgsql: Fix race condition in gettext() initialization in libpq and ecpg

Fix race condition in gettext() initialization in libpq and ecpglib.

In libpq and ecpglib, multiple threads can concurrently enter the
initialization logic for message localization.  Since we set the
its-done flag before actually doing the work, it'd be possible
for some threads to reach gettext() before anyone has called
bindtextdomain().  Barring bugs in libintl itself, this would not
result in anything worse than failure to localize some early
messages.  Nonetheless, it's a bug, and an easy one to fix.

Noted while investigating bug #17299 from Clemens Zeidler
(much thanks to Liam Bowen for followup investigation on that).
It currently appears that that actually *is* a bug in libintl itself,
but that doesn't let us off the hook for this bit.

Back-patch to all supported versions.

Discussion: https://postgr.es/m/17299-7270741958c0b1ab@postgresql.org
Discussion: https://postgr.es/m/CAE7q7Eit4Eq2=bxce=Fm8HAStECjaXUE=WBQc-sDDcgJQ7s7eg@mail.gmail.com

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/37f5dc8b8cb4c3a58b0cc7df36378a1fdc7a8659

Modified Files
--------------
src/interfaces/ecpg/ecpglib/misc.c | 11 +++++++++--
src/interfaces/libpq/fe-misc.c     | 11 +++++++++--
2 files changed, 18 insertions(+), 4 deletions(-)