Fix mingw warnings with -U__STRICT_ANSI__.
We use some C99 features (like lrintf) despite passing -std=c89 -pedantic. This works on normal linux and mac builds because we define _GNU_SOURCE, which enables them, but the mingw32 headers ignore this, generating warnings for lrintf and _putenv, the later hacked in by libtool. Avoid these by undefining __STRICT_ANSI__ in mingw builds, which allows the default extensions and fixes the warnings.
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