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
#ifndef _ISGUID_H
#define _ISGUID_H
#if __GNUC__ >=3
#pragma GCC system_header
#endif
#ifdef __cplusplus
extern "C" {
#endif
extern const GUID CLSID_InternetShortcut;
extern const GUID IID_IUniformResourceLocator;
#ifdef __cplusplus
}
#endif
#endif