pgsql: Remove entab and associated detritus.

Remove entab and associated detritus.

We don't need this anymore, because pg_bsd_indent has been taught to
follow the same tab-vs-space rules that entab used to enforce.

Discussion: /messages/by-id/E1dAmxK-0006EE-1r@gemulon.postgresql.org
Discussion: /messages/by-id/30527.1495162840@sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/81f056c7256f01a39ecc926bf6a4d2d1fa525633

Modified Files
--------------
src/tools/entab/.gitignore | 1 -
src/tools/entab/Makefile | 20 ---
src/tools/entab/entab.1 | 51 --------
src/tools/entab/entab.c | 277 ----------------------------------------
src/tools/pgindent/README | 4 +-
src/tools/pgindent/pgindent | 60 +--------
src/tools/pgindent/pgindent.man | 3 -
7 files changed, 2 insertions(+), 414 deletions(-)

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