Remove some code for old unsupported versions of MSVC

Peter Eisentraut <peter@eisentraut.org>

Commit: 38d8dce61fff09daae0edb6bcdd42b0c7f10ebcd
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-10-08T08:50:54Z
Releases: 13.0
Remove some code for old unsupported versions of MSVC

As of d9dd406fe281d22d5238d3c26a7182543c711e74, we require MSVC 2013,
which means _MSC_VER >= 1800.  This means that conditionals about
older versions of _MSC_VER can be removed or simplified.

Previous code was also in some cases handling MinGW, where _MSC_VER is
not defined at all, incorrectly, such as in pg_ctl.c and win32_port.h,
leading to some compiler warnings.  This should now be handled better.

Reviewed-by: Michael Paquier <michael@paquier.xyz>

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