Add support for ICU 4.2

Supporting ICU 4.2 seems useful because it ships with CentOS 6.

Versions before ICU 4.6 don't support pkg-config, so document an
installation method without using pkg-config.

In ICU 4.2, ucol_getKeywordsForLocale() sometimes returns values that
will not be accepted by uloc_toLanguageTag().  Skip loading keyword
variants in that version.

Reported-by: Victor Wagner <vi...@wagner.pp.ru>

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/eccead9ed43dc6e653c76dce1d2f455d251bb00c

Modified Files
--------------
doc/src/sgml/installation.sgml       | 22 +++++++++++++++++++---
src/backend/commands/collationcmds.c | 11 +++++++++++
2 files changed, 30 insertions(+), 3 deletions(-)


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