scons: Don't fail builds if TERM is not set

Bug: 204817626

Test: Scons build
Change-Id: I154c69503eaededda353d6b2925553b6cecb07eb
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52304
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed