RFA: test that GDB tolerates bad #inclusion data

[Michael Elizabeth Chastain]

Jim, we gotta feed you the gdb_test_multiple kool-aid.
See gdb1250.exp or float.exp or watchpoint.exp.

Also, could you avoid the dependency on gcc version by using
preprocessed ".i" files with the bad line numbers already in them?
Instead of / in addition to the tests with C source.

I will run this patch through my testbed with -g2 and -g3
(I do have -g3 capability, I just don't do it in the weeklies yet)
and will post results in an hour or two.

Michael C