Make svr4_sys_waitsys() a lot less ugly and mark it MPSAFE.

- If the WNOWAIT flag isn't specified and either of WEXITED or WTRAPPED is
  set, then just call kern_wait() and let it do all the work.  This means
  that this function no longer has to duplicate the work to teardown
  zombies that is done in kern_wait().  Instead, if the above conditions
  aren't true, then it uses a simpler loop to implement WNOWAIT and/or
  tracing for only stopped or continued processes.  This function still
  has to duplicate code from kern_wait() for the latter two cases, but
  those are much simpler.
- Sync the code to handle the WCONTINUED and WSTOPPED cases with the
  equivalent code in kern_wait().
- Fix several places that would return with the proctree lock still held.
- Lock the current process to prevent lost wakeup races when blocking.

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