Default mingw _WIN32_WINNT

[Yaakov Selkowitz]

JonY,

In w32api-headers and mingw64-*-headers, the default value of
_WIN32_WINNT can be configured at build-time with --with-default-win32-
winnt=$VER, with the default still being 0x502 (XP x64/2003 R2).  With
2008, 2008 R2, and 7 having gone out of support earlier this year,
Server 2012 is now the oldest currently supported version.  Is it time
to set this to 0x602 by default?

--
Yaakov