Let's set a bit in LDR that should apparently be set.
Let's actually call Init/Shutdown in CoreTiming.
Allow downcount to be negative.

This fixes threads/alarm/alarm and ctrl/sampling2/sampling2, which were
broken in 674911dd.

The downcount can go negative for a few reasons, and was signed before.
Merge pull request #431 from unknownbrackets/timing-fix

Timing fix
Add/update stubs in sceIo
Merge pull request #432 from raven02/master

Add couple of sceIoIoctl commands and misc stubs 
Fixes for Qt, Symbian and Blackberry. Reorder and remove some redundant ArmEmitter includes so that _SP doesn't conflict.