glthread: add nop dispatch

so that glthread behaves the same as the main dispatch.

Also fix the SetError function for GLES 1.0.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14000>

src/mapi/glapi/gen/gl_API.xml

@@ -12869,7 +12869,7 @@
     </function>
 
     <!-- Set a GL error. Used by glthread to set errors without syncing. -->
-    <function name="InternalSetError" es2="2.0">
+    <function name="InternalSetError" es1="1.0" es2="2.0">
         <param name="error" type="GLenum"/>
     </function>
 </category>

src/mapi/glapi/gen/gl_marshal.py

@@ -383,7 +383,7 @@ class PrintCode(gl_XML.gl_print_base):
         with indent():
             out('struct _glapi_table *table;')
             out('')
-            out('table = _mesa_alloc_dispatch_table();')
+            out('table = _mesa_alloc_dispatch_table(true);')
             out('if (table == NULL)')
             with indent():
                 out('return NULL;')