* Implemented TlsVariable, a nifty alternative to __threadlocal, suitable for archaic operating systems that don't have native TLS support (namely Mac OS/X).
* Added a forced reference to TLS in AppInit so that TLS is sure to be available to DLLs (otherwise windows doesn't init TLS by default).
* Disabled TLS support in the x86emitter by default, since it's looking increasingly like we won't find a use for multithreading PS2 sub-components (can be re-enabled later if spontaneous brilliance at a later date proves me wrong).
git-svn-id: http://pcsx2.googlecode.com/svn/trunk@2396 96395faa-99c1-11dd-bbfe-3dabce05a288