scons: Fix the default KVM_ISA setting.

The KVM_ISA setting was moved into a CONF dict, but the code which
ensured it had a default if there was no possible KVM hosting ISA was
still setting that variable in the base environment dict. This moves
the setting into the CONF dict instead.

Change-Id: I067c969dd761b2cdb098bcba6cd6a4b643d2d427
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63752
Reviewed-by: Earl Ou <shunhsingou@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
1 file changed