libgo patch committed: Clean up syscalls, add some Solaris support

[Ian Lance Taylor]

This patch, partly due to Rainer Orth, cleans up the libgo syscalls
directory a bit to remove some redundancy, and adds Solaris support.
Bootstrapped and ran libgo testsuite on x86_64-unknown-linux-gnu in both
32-bit and 64-bit mode.  Committed to mainline.

Ian

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