Move GLES20 source into standard locations
Move Khronos headers into their respective components, to be exported by each.
Remove hostthreadadapter as nothing outside of the vghwapiwrapper, which now contains the code, needs it
/*
File: strings.h
Copyright: Public Domain
This file is provided because non ANSI fuctions are described in string.h
that belong in strings.h. These functions are provided for in the OLDNAME
libraries.
*/
#if !defined(_STRINGS_H_)
# define _STRINGS_H_ 1
# include <string.h>
#endif