glx: stop exporting GL functions from libGLX_mesa.so

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33634>

src/glx/drisw_glx.c

@@ -424,7 +424,20 @@ static const __DRIextension *kopper_extensions_noshm[] = {
 static void
 drisw_wait_gl(struct glx_context *context)
 {
+   /* TODO: Calling glFinish directly is the only thing that causes libGL.so
+    * to export all GL functions. This is fragile and needs a proper solution.
+    *
+    * On top of that, this code is only compiled with GLX_DIRECT_RENDERING,
+    * which means that indirect-only libGL (-Dglx-direct=false) doesn't export
+    * any GL functions.
+    *
+    * TODO: Always use CALL_Finish instead of glFinish.
+    */
+#if USE_LIBGLVND
+   CALL_Finish(GET_DISPATCH(), ());
+#else
    glFinish();
+#endif
 }
 
 static void

src/mapi/glapi/gen/static_data.py

@@ -1678,7 +1678,7 @@ for name in all_functions:
 
 function_count = i
 
-# Exported from libGL.so and libGLX_mesa.so (libEGL_mesa.so doesn't export any)
+# Exported from libGL.so
 libgl_public_functions = {
     "Accum",
     "ActiveShaderProgram",