Fix building std_detect on s390x #4091

Job	Run time
rustfmt	16s
test (macos-latest, aarch64-apple-darwin)	12m 51s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	10m 55s
test (windows-latest, x86_64-pc-windows-gnu)	29m 50s
test (macos-13, x86_64-apple-darwin)	18m 53s
test_llvm	4m 24s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	6m 33s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	5m 33s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	13m 59s
test (windows-latest, x86_64-pc-windows-msvc)	19m 35s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	1m 50s
bench	8m 4s
dist (macos-13, x86_64-apple-darwin)	2m 33s
dist (windows-latest, x86_64-pc-windows-gnu)	3m 5s
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	1m 49s
dist (windows-latest, x86_64-pc-windows-msvc)	2m 12s
dist (macos-latest, aarch64-apple-darwin)	2m 3s
release	12s
	2h 24m 37s

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