Fixed the DSP JIT timing when it is executing in a thread. This allows the Zelda ucode games to run when the "DSPLLE on thread" option has been enabled. However, the DSP Interpreter still hangs when this option is enabled.

* Tightened the timing between the CPU and the DSP in thread mode so that it works closer to how the non-threaded mode works.  The CPU now waits for all of the DSP cycles to be exhausted before adding more cycles.
* DSP Idle skipping has been disabled as it messes up the timing when it is running in a thread.
* Checked for external interrupt requests before entering the dispatcher and inside the dispatcher loop
* Added a critical section around the mailbox read high function

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7040 8ced0084-cf51-0410-be5f-012b33b47a6e

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