Implement SetThreadPriority

[Chris Robinson]

This is a modified patch from Mike Hearn's previous attempt (which can be 
found on the wiki). The changes are that it doesn't play with libcap and root 
capabilities to encourage root usage (setting a non-zero RLIMIT_RTPRIO value 
for 2.6.12 or newer Linux kernels is enough), and it uses the 
sched_get_priority_min function instead of the hardcoded 0 and 1 priority 
values.
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