GCC 4.3 - some patches

[Lorenzo Villani]

Hi, I made some patches for GCC 4.3.1.
These patches are only for build system side, and are adapted from 4.1.x patches (GCC 4.3 seems to use a slightly modified build system).
These files were made in about 45 minutes by a person who doesn't know GCC and it's build system at all, so a review is still required. I tested the patched build system a bit and I found that it correctly begins building gdc, however there are some missing functions in d-lang.cc.
I couldn't test the patched build system more because of compilation error (which you can find here: http://rafb.net/p/Oj7KXP81.html , if you see strange characters like â€~ it's most probably a quote).

I hope that gdc will work with GCC 4.3 soon so that it can have more chances to get into Fedora 9.