pgsql: Remove pg_control's enableIntTimes field.

Remove pg_control's enableIntTimes field.

We don't need it any more.

pg_controldata continues to report that date/time type storage is
"64-bit integers", but that's now a hard-wired behavior not something
it sees in the data. This avoids breaking pg_upgrade, and perhaps other
utilities that inspect pg_control this way. Ditto for pg_resetwal.

I chose to remove the "bigint_timestamps" output column of
pg_control_init(), though, as that function hasn't been around long
and probably doesn't have ossified users.

Discussion: https://postgr.es/m/26788.1487455319@sss.pgh.pa.us

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/d28aafb6dda326688e2f042c95c93ea57963c03c

Modified Files
--------------
doc/src/sgml/func.sgml | 5 -----
src/backend/access/transam/xlog.c | 21 ---------------------
src/backend/utils/misc/pg_controldata.c | 23 +++++++++--------------
src/bin/pg_controldata/pg_controldata.c | 3 ++-
src/bin/pg_resetwal/pg_resetwal.c | 8 ++------
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_control.h | 5 +----
src/include/catalog/pg_proc.h | 2 +-
8 files changed, 16 insertions(+), 53 deletions(-)