fix the failing regression.  the sconscript ("makefile") was missing the etherbus.cc src file.
fix the failing regression.  the sconscript ("makefile") was missing the etherbus.cc src file.

SConscript:
    THIS is why the regression keeps failing.  it's missing the the etherbus file in the sconscript.

--HG--
extra : convert_revision : adbcfb6036d8e8ecb51c4f484d0030059542684b

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