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Windows-host c-abi probe strips host predefines; freestanding wchar realisation always emits -fno-short-wchar (2026.9.18.3) #2014

Job	Run time
toolchain: gcc (cold self-host)	11m 50s
examples: the curriculum builds	11m 33s
toolchain: musl + llvm	11m 57s
integration: mcpp builds & runs xlings	10m 29s
build + unit tests (linux x86_64, self-host)	14m 3s
	59m 52s