Better than an unlikely abort().

(Eventually, this could replace block_FifoWake))

Every thread function disables cancellation properly now.

Use SleepEx so APC can be executed

__thread is non-standard (and would need mingw 4.3).

Remeber that N_( DEFINE ) is not enough

Spotted-by: Cristian Secară

Too much workaround to use it.

It makes DVD (menu) usable (at least #1784, #1880).