contrib: Fix the check for _UCRT
_UCRT is not a compiler internal define. Some build scripts may be invoking the compiler with an explicit -D_UCRT, but if not, the toolchain default is set by the toolchain headers. Therefore, include crtdefs.h to pull in default headers for checking whether it is set or not. Also check for older forms of mingw-w64, which didn't use the define _UCRT to signal the type of CRT.
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