Remove defs.hpp.

Because we now own the 'tools' subdirectory in the tree, we can yank some
of the upstream autoconf-related complexity. Start doing so by removing
defs.hpp and using the real compil

Remove defs.hpp.

Because we now own the 'tools' subdirectory in the tree, we can yank some
of the upstream autoconf-related complexity. Start doing so by removing
defs.hpp and using the real compiler attributes where necessary.

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Merge atf-0.19.

Import ATF 0.6. Replaces the old ATF 0.5 that was in dist/atf.

Changes in this release:

* Make atf-exec be able to kill its child process after a certain period of
time; this is controlled throu

Import ATF 0.6. Replaces the old ATF 0.5 that was in dist/atf.

Changes in this release:

* Make atf-exec be able to kill its child process after a certain period of
time; this is controlled through the new -t option.

* Change atf-sh to use atf-exec's -t option to control the test case's
timeouts, instead of doing it internally. Same behavior as before, but
noticeably faster.

* atf-exec's -g option and atf-killpg are gone due to the previous change.

* Added the atf-check(1) tool, a program that executes a given command and
checks its exit code against a known value and allows the management of
stdout and stderr in multiple ways. This replaces the previous atf_check
function in the atf-sh library and exposes this functionality to both
atf-c and atf-c++.

* Added the ATF_REQUIRE family of macros to the C interface. These help
in checking for fatal test conditions. The old ATF_CHECK macros now
perform non-fatal checks only. I.e. by using ATF_CHECK, the test case
can now continue its execution and the failures will not be reported
until the end of the whole run.

* Extended the amount of ATF_CHECK_* C macros with new ones to provide more
features to the developer. These also have their corresponding
counterparts in the ATF_REQUIRE_* family. The new macros (listing the
suffixes only) are: _EQ (replaces _EQUAL), _EQ_MSG, _STREQ and
_STREQ_MSG.

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