Setting test suite not to try debug output cases

[Koning, Paul]

Given that pdp11 no longer supports debug output, I get a lot more test failures, like this:

spawn -ignore SIGHUP /Users/pkoning/Documents/svn/build/pdp/gcc/xgcc -B/Users/pkoning/Documents/svn/build/pdp/gcc/ -mlra -fdiagnostics-plain-output -Og -g -w -c -o 20000105-1.o /Users/pkoning/Documents/svn/gcc/gcc/testsuite/gcc.c-torture/compile/20000105-1.c
xgcc: warning: target system does not support debug output
cc1: warning: target system does not support debug output
FAIL: gcc.c-torture/compile/20000105-1.c   -Og -g  (test for excess errors)

I assume there is some way in the test suite machinery to globally skip all "debug output" cases.  How would I do that?

	paul