toolchain/49187: ATF detect_unused_tests tests failing

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         49187
>Category:       toolchain
>Synopsis:       ATF detect_unused_tests tests failing
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 09 10:45:00 +0000 2014
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date > 2014-03-11 23:22:36
>Organization:

>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

The following tests have been failing on the TNF testbed on each
of amd64, i386, and sparc ever since they were switched to gcc 4.8:

  atf/atf-c/macros_test/detect_unused_tests
  atf/atf-c++/macros_test/detect_unused_tests

In a discussion on current-users on March 27, Martin Husemann noted:

> The detect_unused_tests are generic gcc 4.8.x bugs, there are upstream
> tickets for it (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57201).

I'm filing this as a PR so that the tests can be marked as expected
failures.

>How-To-Repeat:

Run the ATF tests.

>Fix: