Revert "Get rid of PIXMAP_RGB24"

This reverts commit a0cca544816f99e4c6b3697e93f9ad774aeca452.

Conflicts:

	src/fileaccess/fa_imageloader.c
trace: Don't print empty lines
glw: Change blending so the alpha component is correct when used by display compositors
rpi: Set -mcpu=arm1176jzf-s in CFLAGS
rpi: Audio support (only over HDMI right now)
Add multi language support to TheTVDB integration

Fixes #1544