scons: compile on systems where python2 and python3 co-exist Compile gem5 on systems where python2 and python3 co-exists without any changes in path. python2-config is chosen over python-config if it exists.
scons: compile on systems where python2 and python3 co-exist
Compile gem5 on systems where python2 and python3 co-exists without any
changes in path. python2-config is chosen over python-config if it exists.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>

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