pgsql: Simplify overly-cute array coding to avoid an apparent gcc bug,

Log Message:
-----------
Simplify overly-cute array coding to avoid an apparent gcc bug, which
may or may not be harmless. Report from Stefan, patch from Heikki.

Modified Files:
--------------
pgsql/contrib/pg_trgm:
trgm_op.c (r1.8 -> r1.9)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_trgm/trgm_op.c.diff?r1=1.8&r2=1.9)