pgsql: Remove trailing commas in enums.

Remove trailing commas in enums.

These aren't valid C89. Found thanks to gcc's -Wc90-c99-compat. These
exist in differing places in most supported branches.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/533cd2303aa6558721e76295fd1ffb05211764f9

Modified Files
--------------
src/backend/executor/execIndexing.c | 2 +-
src/include/access/xlog_internal.h | 2 +-
src/include/pgstat.h | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

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