util-gem5art: Update .gitignore to ingore run results
util-gem5art: Update .gitignore to ingore run results

Change-Id: Iedb944c2be7889dbf3d9eaabb78c4a1bc967af3e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47222
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>

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