(OpenVG) Build fix
Get rid of some scaler header dependencies
Merge pull request #1183 from sergiobenrocha2/master

content.h and fix path to config_file.h
Fixup some headers
Remove boolean.h - now in libretro SDK
(filters) Kill some header include dependencies
Move scaler code over to libretro SDK
Take out some header includes in state_tracker.c
(SDK) Move math/matrix code to SDK
(Input) Add Analog To Digital Type options
Fix build with OpenVG enabled, missing header.