The define kCGBitmapByteOrder32Host changed (around SDK 12?)
into an enum, which means an old #ifndef was triggering,
overwriting the value to 0. Sadly, 0 means Order16Big, causing
RGBA to become GRAB, which results in strange colours.
As we no longer support PPC, drop that piece of code completely.
(cherry picked from commit 5ac333c2cc)
66b324a4c0