gh-148690: Build Windows freethreaded binaries into separate director… #2333

Job	Run time
x86_64-unknown-linux-gnu/gcc-free-threading	8m 38s
aarch64-unknown-linux-gnu/gcc	7m 6s
x86_64-apple-darwin/clang	19m 16s
aarch64-apple-darwin/clang	9m 45s
x86_64-unknown-linux-gnu/gcc	10m 34s
	55m 19s

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