scons: Use a different suffix for test object files.

These files are built with a different command line, and so should be
distinct build artifacts in the build directory.

Change-Id: Iec9403ad73fbdbcb1cd268d68716c3aa85a80b24
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48137
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
1 file changed