Allow f16 and f128 on s390x and non-mingw windows #4244

Job	Run time
rustfmt	14s
bench	6m 38s
test_llvm	4m 0s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	9m 56s
test (macos-15-intel, x86_64-apple-darwin)	19m 47s
test (macos-latest, aarch64-apple-darwin)	15m 52s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	4m 44s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	12m 16s
test (windows-latest, x86_64-pc-windows-msvc)	19m 6s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	4m 22s
test (windows-latest, x86_64-pc-windows-gnu)	27m 46s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	1m 38s
dist (windows-latest, x86_64-pc-windows-gnu)	2m 50s
dist (macos-15-intel, x86_64-apple-darwin)	2m 51s
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	1m 45s
dist (macos-latest, aarch64-apple-darwin)	2m 33s
dist (windows-latest, x86_64-pc-windows-msvc)	2m 31s
release	-1s
	2h 18m 48s

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