pyx.build: Adjust compile flags if we are on Windows/MSVC
MSVC does not accept -std=c++11 but instead accepts /std:c++11. We cannot use that however because with /std:c++11 compilation fails with .\golang/libgolang.h(280): error C7555: use of designated initializers requires at least '/std:c++20' .\golang/libgolang.h(294): error C7555: use of designated initializers requires at least '/std:c++20' .\golang/libgolang.h(308): error C7555: use of designated initializers requires at least '/std:c++20' for 276 // _selsend creates `_chansend(ch, ptx)` case for _chanselect. 277 static inline 278 _selcase _selsend(_chan *ch, const void *ptx) { 279 _selcase _ = { 280 .ch = ch, <-- NOTE 281 .op = _CHANSEND, 282 .flags = (enum _selflags)0, 283 .user = 0xff, 284 }; and similar places. -> Use /std:c++20 instead as MSVC advices (WOW designated initializers are C99 and it took 21 years for C++ to catch up). We also need to adjust exception handling mode into "fully conformant" instead of "assume extern C cannot throw" setuptools default so that `panic` and other extern C libgolang functions generate exceptions that could be caught instead of crashing programs. For C vs C++ flags we also need to adjust our build_ext, because the way setuptools/distutils organize compilation for MSVC is different from UNIX compilers.
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