Update to the 20100622 snapshot of GCC 4.4.5. This brings this version
of GCC more in sync with the FreeBSD system compiler enabling features
such as __stack_chk_fail, fixing libffi and libmudflap support as well
as enabling default_use_cxa_atexit. lang/gcc45 and lang/gcc46 already
feature all of these improvements.

Simplify full-regression-test.

Feature safe: yes