[COMMITTERS] pgsql: Add configure infrastructure to detect support for C99'srestric

Add configure infrastructure to detect support for C99's restrict.

Will be used in later commits improving performance for a few key
routines where information about aliasing allows for significantly
better code generation.

This allows to use the C99 'restrict' keyword without breaking C89, or
for that matter C++, compilers. If not supported it's defined to be
empty.

Author: Andres Freund
Discussion: https://postgr.es/m/20170914063418.sckdzgjfrsbekae4@alap3.anarazel.de

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0b974dba2d6b5581ce422ed883209de46f313fb6

Modified Files
--------------
configure                     | 46 +++++++++++++++++++++++++++++++++++++++++++
configure.in                  |  1 +
src/include/pg_config.h.in    | 14 +++++++++++++
src/include/pg_config.h.win32 | 11 +++++++++++
4 files changed, 72 insertions(+)


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