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Windows-host c-abi probe strips host predefines; freestanding wchar realisation always emits -fno-short-wchar (2026.9.18.3) #582

Job	Run time
openkal e2e (the scripts, on a runner that has llvm)	9m 4s
build 3 targets on windows	7m 19s
build 3 targets on macos	4m 46s
build 3 targets on linux	8m 30s
run 3 builds on windows	7s
run 3 builds on linux	8s
run 3 builds on macos	7s
	30m 1s