Makefiles: define `-D__USE_MINGW_ANSI_STDIO=0` when compiling under MinGW
Otherwise, `PRIxPTR` expands to `llx` (rather than to `I64x` as used by MSVC runtime)
and GCC 10 will issue a warning. Consequently, code compiled with `-Werror`
would fail to compile.
Copyright (c) 2010-now Jan Vrany <jan.vrany (a) fit.cvut.cz>
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