* java/lang/PosixProcess.java (exitValue): Implement here. Throw
IllegalThreadStateException if process hasn't exited yet.
* java/lang/natPosixProcess.cc (exitValue): Removed.
(waitFor): Only check thread interrupted status if waitpid()
returned an error. Use WIFEXITED and WEXITSTATUS to process process's
exit value.
From-SVN: r45766
