[Gc] Symbian support

[djamel magri]

Hi Hans,

I have ported 7.1 on Symbian 3rd and 5th edition(monothreaded for now), that
works on emulator(a bit hacked for static roots) and on target(tested on armv5
with linker symbols).
If interested I can send you the sources(I have not created a patch tough).
It will require some tidy up and multithreaded support(start/stop world +
mutexes for allocations)
It requires installation of open C.

Kind regards
Djamel