Discrepancy between specification and XML/headers around CL-GL interop function prototypes

The extension specification uses GLenum, GLint and GLuint but the headers and XML use and define cl_GLenum, cl_GLint and cl_GLuint. I'm guessing this was done to avoid a dependency on the OpenGL headers. Maybe we could conditionally define aliases to the GL types when those are not already defined? I assume that sizes, etc are all correct so this is mostly cosmetic but might still confuse people.

Compare the extension specification's CL-GL prototypes with the corresponding headers and XML definitions, starting from the definitions of cl_GLenum, cl_GLint, and cl_GLuint. Review how these relate to GLenum, GLint, and GLuint and the stated goal of avoiding OpenGL header dependencies. Done means the specification, headers, and XML consistently describe the agreed types.