Enable per-thread errno on Solaris
Add support for manipulating thread priority on Solaris
Add ucontext_t support to Solaris
Merge branch 'master' into thread_priority

Conflicts:
	posix.mak

Merged upstream
Final (hopefully) fixes
Added missing entries to manifest
Moved imports to avoid triggering errors on other platforms
Fixed windows make files (hopefully)
Style nits; fixed a minor typo in exception message
Merge pull request #871 from jasonbking/thread_priority

Fix 13058 - Thread priority handling doesn't work in Solaris