mesa: Rename API_OPENGL to API_OPENGL_COMPAT.

This should help avoid confusion now that we're using the gl_api enum
to distinguishing between core and compatibility API's.  The
corresponding enum value for core API's is API_OPENGL_CORE.

Acked-by: Eric Anholt <eric@anholt.net>
Acked-by: Matt Turner <mattst88@gmail.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/glcpp/glcpp.c

@@ -111,7 +111,7 @@ main (int argc, char *argv[])
 	if (shader == NULL)
 	   return 1;
 
-	ret = glcpp_preprocess(ctx, &shader, &info_log, NULL, API_OPENGL);
+	ret = glcpp_preprocess(ctx, &shader, &info_log, NULL, API_OPENGL_COMPAT);
 
 	printf("%s", shader);
 	fprintf(stderr, "%s", info_log);