Failure with sha-1 crate due to cpuid

[vi]

It builds, but when running it fails:

trap at Instance { def: Item(WithOptConstParam { did: DefId(1:12896 ~ core[8231]::core_arch::x86::cpuid::__cpuid_count), const_param_did: None }), substs: [] } (_ZN4core9core_arch3x865cpuid13__cpuid_count17hcfa5bc63bfe66a21E): __cpuid_count arch intrinsic doesn't yet support specified

Workaround: use "force-soft" feature of sha-1:

sha-1={version="0.9", features=["force-soft"]}

[bjorn3]

sha-1 uses cpufeatures which requests leaf 7 of the cpuid. std_detect (which provides is_*_feature_detected!()) only uses leaf 0, 1, 0x8000_0000 and 0x8000_0001, which means that I only implemented a fake cpuid for those leafs. cpufeatures also requires leaf 7 subleaf 0.

[bjorn3]

All subleaves of leaf 7 now return 0.