Merge from vendor branch GCC:

Merge from vendor branch GCC:
- Update GCC to version 3.4.3.
- Remove some unused files from the repository.
- Change default debug format back to DWARF-2, since gdb 6 works better with
  it.
- Compile libobjc dynamically too, it helps e.g. GnuStep.
- Install MMX/SSE/... support headers under /usr/libdata/gcc34.