scons: Delete the comparison operators from SourceFile.
scons: Delete the comparison operators from SourceFile.

These are apparently not used and can be deleted.

Change-Id: I201d565d2e0207e0f43e94bbbb43ec03c2b695ab
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48125
Reviewed-by: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Reviewed-by: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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