Merge branch 'master' into vblank-rework, including mach64 support

Conflicts:

	linux-core/drmP.h
	linux-core/drm_drv.c
	shared-core/i915_drv.h
	shared-core/i915_irq.c
	shared-core/mga_irq.c
	shared-core/radeon_irq.c
	shared-core/via_irq.c

Mostly trivial conflicts.

mach64 support from Mathieu Bérard.