Fix DROP ACCESS METHOD IF EXISTS.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 83dbde94f726f2517a79b1cea59e57452c36e734
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-05-27T15:03:18Z
Releases: 9.6.0
Fix DROP ACCESS METHOD IF EXISTS.

The IF EXISTS option was documented, and implemented in the grammar, but
it didn't actually work for lack of support in does_not_exist_skipping().
Per bug #14160.

Report and patch by Kouhei Sutou

Report: <20160527070433.19424.81712@wrigleys.postgresql.org>

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