scons: Don't fail builds if TERM is not set
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 <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Maintainer: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5