add ~riscv keyword
tatt test report: USE tests started on Mon Oct 10 10:00:24 -00 2022 FEATURES=' test' USE='' succeeded for =app-benchmarks/geekbench-5.4.5 USE='' succeeded for =app-benchmarks/geekbench-5.4.5
Unable to check for sanity: > package masked: app-benchmarks/geekbench-5.4.5, by keywords: -riscv
x86 only software, close this bug