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/main.cpp

@@ -223,7 +223,7 @@ main(int argc, char **argv)
    if (argc <= optind)
       usage_fail(argv[0]);
 
-   initialize_context(ctx, (glsl_es) ? API_OPENGLES2 : API_OPENGL);
+   initialize_context(ctx, (glsl_es) ? API_OPENGLES2 : API_OPENGL_COMPAT);
 
    struct gl_shader_program *whole_program;