* Referring the current haiku version explicitly is not needed, since
the RequiresUpdater takes care of setting the version of Haiku used
for building a package.
* portVersionedName contains the secondary architecture,
so using it means secondary package builds fail.
example: $portVersionedName is libwow_x86-0.0.0 when
doing an x86 build on x86_gcc2
* The files are no longer installed in a separate develop/tools
subdirectory for binutils and one for gcc. Instead we install
directly in develop/tools[/<arch>]. This allows gcc to find gas and
ld via its built-in search instead of via PATH only. In a hybrid
setup this makes a difference, when the gcc that is not the first in
PATH is invoked directly (e.g. via absolute path).
* Add support for building for the secondary architecture. Not tested
yet.
