Provide option to build with -D__USE_MINGW_ANSI_STDIO

Provide option to build with -D__USE_MINGW_ANSI_STDIO

This commit adapts and extends a patch from sisyphus1@optusnet.com.au on
perl #130447.

Note for the future: One of the MinGW/gcc developers has said that
explicitly defining __USE_MINGW_ANSI_STDIO in this way is not guaranteed
to work in the future, so we may have to pursue other options instead one
day: https://rt.perl.org/Ticket/Display.html?id=130447#txn-1461711

However, we already do this for "nvtype=long double" builds and it's
working fine so far, so it seems acceptable to allow the same thing for
"nvtype=double" builds for now.