[OpenBIOS] Unix host without libc

[Blue Swirl]

Hi,

Portions of Linux libc and ld.so for Sparc64 use very advanced, handcrafted 
assembly, and some of those instructions (VIS I, II) are not implemented yet 
by Qemu. This patch adds an optional statically linked Unix target, which 
bypasses the libc. The resulting binary is compiled 100% from OpenBIOS 
sources, so I have complete control for optimisation etc. I already found 
one small bug in Qemu with this version.

Interestingly, in Qemu openbios-unix-static crashes in docol, when the 
rstack overflows. This doesn't happen in native Sparc64. But I don't know 
how to debug Forth execution problems, any clue?

I think the code is somewhat portable within Linux, probably not to other 
Unixy systems. Though I don't think the patch has much general use.

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