pgsql: Suppress compiler warnings in non-cassert builds.

Suppress compiler warnings in non-cassert builds.

With Asserts off, these variables are set but never used, resulting
in warnings from pickier compilers. Fix that with our standard solution.
Per report from Jeff Janes.

Branch
------
REL9_6_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/5c0b74240cb1f25a09b9b38d7cb665c0935a5d81

Modified Files
--------------
src/backend/access/gist/gistutil.c | 2 +-
src/backend/utils/adt/amutils.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

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