Ignore rt_sigaction() syscalls on x86 and x86_64
Ignore rt_sigaction() syscalls on x86 and x86_64

This is currently how alpha handles this syscall.

This is needed for the gcc spec2k benchmarks to run.

TUD-OS/gem5-dtu,joerocklin/gem5,joerocklin/gem5,gedare/gem5,yb-kim/gemV,markoshorro/gem5,briancoutinho0905/2dsampling,Weil0ng/gem5,briancoutinho0905/2dsampling,cancro7/gem5,rjschof/gem5,markoshorro/gem5,SanchayanMaity/gem5,yb-kim/gemV,rallylee/gem5,markoshorro/gem5,cancro7/gem5,gedare/gem5,rallylee/gem5,briancoutinho0905/2dsampling,KuroeKurose/gem5,TUD-OS/gem5-dtu,joerocklin/gem5,SanchayanMaity/gem5,rjschof/gem5,austinharris/gem5-riscv,joerocklin/gem5,aclifton/cpeg853-gem5,Weil0ng/gem5,HwisooSo/gemV-update,briancoutinho0905/2dsampling,kaiyuanl/gem5,SanchayanMaity/gem5,TUD-OS/gem5-dtu,zlfben/gem5,kaiyuanl/gem5,Weil0ng/gem5,zlfben/gem5,qizenguf/MLC-STT,cancro7/gem5,Weil0ng/gem5,austinharris/gem5-riscv,sobercoder/gem5,samueldotj/TeeRISC-Simulator,rallylee/gem5,HwisooSo/gemV-update,gem5/gem5,samueldotj/TeeRISC-Simulator,gedare/gem5,SanchayanMaity/gem5,sobercoder/gem5,rallylee/gem5,rallylee/gem5,Weil0ng/gem5,cancro7/gem5,KuroeKurose/gem5,briancoutinho0905/2dsampling,yb-kim/gemV,sobercoder/gem5,zlfben/gem5,SanchayanMaity/gem5,SanchayanMaity/gem5,rallylee/gem5,powerjg/gem5-ci-test,gedare/gem5,kaiyuanl/gem5,briancoutinho0905/2dsampling,austinharris/gem5-riscv,gem5/gem5,joerocklin/gem5,qizenguf/MLC-STT,HwisooSo/gemV-update,gem5/gem5,powerjg/gem5-ci-test,samueldotj/TeeRISC-Simulator,gem5/gem5,KuroeKurose/gem5,sobercoder/gem5,powerjg/gem5-ci-test,gedare/gem5,rjschof/gem5,Weil0ng/gem5,rjschof/gem5,qizenguf/MLC-STT,rjschof/gem5,gem5/gem5,TUD-OS/gem5-dtu,KuroeKurose/gem5,yb-kim/gemV,powerjg/gem5-ci-test,aclifton/cpeg853-gem5,rjschof/gem5,yb-kim/gemV,gem5/gem5,cancro7/gem5,markoshorro/gem5,austinharris/gem5-riscv,zlfben/gem5,briancoutinho0905/2dsampling,zlfben/gem5,powerjg/gem5-ci-test,KuroeKurose/gem5,gedare/gem5,sobercoder/gem5,powerjg/gem5-ci-test,joerocklin/gem5,kaiyuanl/gem5,austinharris/gem5-riscv,HwisooSo/gemV-update,yb-kim/gemV,markoshorro/gem5,joerocklin/gem5,HwisooSo/gemV-update,HwisooSo/gemV-update,qizenguf/MLC-STT,cancro7/gem5,samueldotj/TeeRISC-Simulator,kaiyuanl/gem5,kaiyuanl/gem5,cancro7/gem5,samueldotj/TeeRISC-Simulator,powerjg/gem5-ci-test,yb-kim/gemV,aclifton/cpeg853-gem5,sobercoder/gem5,sobercoder/gem5,kaiyuanl/gem5,KuroeKurose/gem5,aclifton/cpeg853-gem5,markoshorro/gem5,gedare/gem5,TUD-OS/gem5-dtu,qizenguf/MLC-STT,aclifton/cpeg853-gem5,KuroeKurose/gem5,zlfben/gem5,samueldotj/TeeRISC-Simulator,zlfben/gem5,HwisooSo/gemV-update,gem5/gem5,markoshorro/gem5,yb-kim/gemV,joerocklin/gem5,qizenguf/MLC-STT,samueldotj/TeeRISC-Simulator,aclifton/cpeg853-gem5,rallylee/gem5,SanchayanMaity/gem5,qizenguf/MLC-STT,aclifton/cpeg853-gem5,austinharris/gem5-riscv,Weil0ng/gem5,TUD-OS/gem5-dtu,austinharris/gem5-riscv,rjschof/gem5,TUD-OS/gem5-dtu