Recent new atf test failures

[Paul Goyette <paul%whooppee.com@localhost>]

Some time in the last two weeks, we've had a few new test cases failing 
in my amd64 test-bed.

Tests that used to pass, but currently failing

        lib/csu/t_crt0/initfini3
        atf/atf-c/macros_test/detect_unused_tests
        atf/atf-c++/macros_test/detect_unused_tests

Tests that currently fail, but don't seem to exist in older builds

        lib/libm/t_exp/exp2_powers
        lib/libm/t_exp/exp2_values



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