libgo patch committed: If using DejaGNU, don't frob log file

[Ian Lance Taylor]

If the libgo testsuite is using DejaGNU, there is no need to frob the
log file to make it look like DejaGNU output.  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu (without DejaGNU).  Committed to
mainline.

Ian