We dropped support for MSVC long ago, and nowadays only support
MinGW for the MS-Windows builds of Emacs.
* src/w32term.h:
* src/w32fns.c:
* src/w32.c:
* nt/inc/sys/socket.h:
* nt/inc/stdalign.h:
* nt/inc/ms-w32.h: Remove MSVC-specific code and preprocessor
conditions.
* nt/inc/ms-w32.h: Don't redirect Posix functions to MS _FOO
equivalents, as MinGW headers do that nowadays better, not
necessarily via functions, and do not disable that when __STDC__
is defined.
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