Fix [59a2e78e54d3361c33b8cd6eef55d384d8abecd7|59a2e78e54] : tclWinTime.c does not compile with MSVC14. 
Eliminate use of __MINGW32__ macro everywhare, as it is deprecated.
Fix [59a2e78e54d3361c33b8cd6eef55d384d8abecd7|59a2e78e54] : tclWinTime.c does not compile with MSVC14. 
Eliminate use of __MINGW32__ macro everywhare, as it is deprecated.