GL_ARB_shading_language_include
http://www.opengl.org/registry/specs/gl/ARB/shading_language_include.txt
GL_ARB_shading_language_include
	GL_SHADER_INCLUDE_ARB 0x8DAE
	GL_NAMED_STRING_LENGTH_ARB 0x8DE9
	GL_NAMED_STRING_TYPE_ARB 0x8DEA
	void glCompileShaderIncludeARB (GLuint shader, GLsizei count, const GLchar* const *path, const GLint *length)
	void glDeleteNamedStringARB (GLint namelen, const GLchar* name)
	void glGetNamedStringARB (GLint namelen, const GLchar* name, GLsizei bufSize, GLint *stringlen, GLchar *string)
	void glGetNamedStringivARB (GLint namelen, const GLchar* name, GLenum pname, GLint *params)
	GLboolean glIsNamedStringARB (GLint namelen, const GLchar* name)
	void glNamedStringARB (GLenum type, GLint namelen, const GLchar* name, GLint stringlen, const GLchar *string)