LLVM CI

Add MinGW-w64 CI workflow for stdlib and compiler specs #4259

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Job	Run time
LLVM 13	29m 25s
LLVM 14	28m 0s
LLVM 15	29m 38s
LLVM 16	25m 28s
LLVM 17	27m 49s
LLVM 18	28m 43s
LLVM 19	27m 40s
	3h 16m 43s