Fix some missing/black screens in FBO to memory mode
Symbian: Make distribution easier.
Allow selection of GPU in headless.
Check size is within bounds in AllocAt().
Merge pull request #3739 from unknownbrackets/headless

Allow selection of GPU in headless
Merge pull request #3740 from unknownbrackets/block-alloc

Check size is within bounds in AllocAt()
Update ppc jit
jit fixes
use _alloca
fix Jit
recompile shift left/right immediate
more jitted instructions
implement sltiu, slti is bad
Add some badly tested instruction
Almost all alu recompiled
Current issues:
	Comp_RType3(min/max): Can't select start in disgaea
	Comp_ShiftType(srl/srlv?): Crash ridge racer 2
recompile Fpu !
some new recompiled instructions
oops missed fpu reg cache
update ppc jit
more on vfpu