Convert to new world order by defining TARGET_OS_CPP_BUILTINS instead of
CPP_PREDEFINES; try to deuglify CPP_SPEC whenever possible as well.

Remove incorrect -pthread preprocessor define _POSIX_THREADS and replace
with _REENTRANT. Also remove undef _POSIX_THREADS in phread.h.
From brad@comstyle.com. okay guenther@

- revert thread model posix since it broke the build for hppa. will revist
when all archs are fully tested and working.
- major bump libstdc++

- enable thread model posix for gcc 3 which makes dwarf2 exception
handling thread safe and enables thread safety for libstdc++
- include -D_REENTRANT when -pthread cpp arg is present (needed so
boos

- enable thread model posix for gcc 3 which makes dwarf2 exception
handling thread safe and enables thread safety for libstdc++
- include -D_REENTRANT when -pthread cpp arg is present (needed so
boost can detect -pthread on the command line).
- bump libstdc++ major

See faq/current.html for instructions on how to correctly build
userland for this change.

okay kettenis@

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INTMAX_TYPE and UINTMAX_TYPE are always in terms of long long on
OpenBSD, regardless of the size of a long.
OK kettenis@ espie@

Adapt to the machine/_types.h changes; size_t and ptrdiff_t are now
defined in terms of long, not int on all architectures.

Import gcc-3.3.2. Only the compiler. ada frontend removed for space
considerations.