There was a bug with the SST and SystemC tests where they wouldn't compile due to a missing path for the gdbremote/signals.hh header, and this change includes that so they run properly. Change-Id: I9ff0404e327358fe2d1b77388bbcc1f807136ebe Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67817 Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu> Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>