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.

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build
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config.rb
.rake_tasks~