[clang] [clang] [MinGW] Don't look for a GCC in path if the install base has a proper mingw sysroot (PR #76949)

[Martin Storsjö via cfe-commits]

mstorsjo wrote:

CC @mati865 @jeremyd2019 @huangqinjin

https://github.com/llvm/llvm-project/pull/76949
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