When GL_EXT_mesh_shader is enabled, the check of layout qualifiers 'max_vertices' and 'max_primitives' should use gl_MaxMeshOutputVerticesEXT and gl_MaxMeshOutputPrimitivesEXT.
When GL_EXT_mesh_shader is enabled, the check of layout qualifiers 'max_vertices' and 'max_primitives' should use gl_MaxMeshOutputVerticesEXT and gl_MaxMeshOutputPrimitivesEXT.