scons: Warn for incompatible gcc and binutils
scons: Warn for incompatible gcc and binutils

It seems gcc >4.8 does not get along well with binutils <= 2.22, and
to help users this patch adds a warning with an indication for how to
fix the issue. It might even be worth adding a Exit(-1) and stop the
build.

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