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Allow `Error::raw_os_error` to return non-`i32` codes #191

Job	Run time
Cross (sparcv9-sun-solaris)	37s
ESP-IDF	20s
Linux x32 (x86_64-unknown-linux-gnux32)	20s
Cross (x86_64-unknown-illumos)	36s
Apple Other	1m 5s
No Atomics	21s
RDRAND UEFI (x86_64-unknown-uefi)	24s
RNDR	26s
Tier 2 (x86_64-unknown-fuchsia)	39s
RDRAND UEFI (i686-unknown-uefi)	23s
Tier 2 (x86_64-unknown-redox)	34s
Tier 3 (aarch64-kmc-solid_asp3)	21s
Tier 2 (x86_64-fortanix-unknown-sgx)	19s
Web no_std	26s
Tier 3 (aarch64-unknown-nto-qnx710)	25s
Web no_std with Atomics	26s
Tier 3 (armv6k-nintendo-3ds)	25s
Web	32s
Tier 3 (armv7-sony-vita-newlibeabihf)	27s
Web with Atomics	31s
Tier 3 (i686-unknown-hurd-gnu)	24s
WasmV1 no_std	22s
Tier 3 (x86_64-unknown-hermit)	22s
WasmV1 no_std with Atomics	26s
Tier 3 (x86_64-wrs-vxworks)	22s
Tier 3 (x86_64-unknown-dragonfly)	22s
Tier 3 (x86_64-unknown-haiku)	23s
	12m 18s

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