pgsql: Tweak initdb's text search configuration selection code so it can

Log Message:
-----------
Tweak initdb's text search configuration selection code so it can
cope with LANG settings like 'es_ES@euro'.

Modified Files:
--------------
pgsql/src/bin/initdb:
initdb.c (r1.141 -> r1.142)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c?r1=1.141&r2=1.142)