[RFA] Testsuite: skip tests that depend on stdio support.

[Michael Snyder]

Fernando Nasser wrote:
> 
> Michael, the part described in the ChangeLog is OK, however...
> 
> You are also adding (without a proper ChangeLog entry) a clause to gdb_test that
> considers as failed if the test program ends normally.  I believe there are some tests
> that run a program to the end and they'll not be able to use gdb_test (so you may have
> to change these tests if we decide this is the way to go).

Ah yes, I forgot that bit.  Please consider it removed from
this patch -- I mean to submit it separately.

> Anyway, the skipping part is approved, the changes to gdb_test are not (pending
> proper submission).

Cool, I'll commit the approved bits and resubmit the other.