Cross-compiling via MinGW with wine-binfmt: Cannot determine executable suffix

[John Scott]

> ./configure --host=x86_64-w64-mingw32
> make
> make check
> 
> seems to run the tests under wine here...
It still fails if I invoke it like that, but I'm glad you pointed out the 
issue is with the build system compiler. Since ./configure doesn't think it's 
cross-compiling, it needs help to figure out my build system compiler. This 
works:
CC_FOR_BUILD=gcc ./configure --host=x86_64-w64-mingw32

and the tests pass. Thank you
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