st/mesa: expose EXT_disjoint_timer_query

same cap as ARB_timer_query, no changes needed, tested by piglit

docs/relnotes/18.3.0.html

@@ -55,6 +55,7 @@ Note: some of the new features are only available with certain drivers.
 <li>GL_AMD_gpu_shader_int64 on i965, nvc0, radeonsi.</li>
 <li>GL_AMD_multi_draw_indirect on all GL 4.x drivers.</li>
 <li>GL_AMD_query_buffer_object on i965, nvc0, r600, radeonsi.</li>
+<li>GL_EXT_disjoint_timer_query on radeonsi and most other Gallium drivers (ES extension)</li>
 <li>GL_EXT_vertex_attrib_64bit on i965, nvc0, radeonsi.</li>
 <li>GL_EXT_window_rectangles on radeonsi.</li>
 </ul>

src/mesa/state_tracker/st_extensions.c

@@ -709,6 +709,7 @@ void st_init_extensions(struct pipe_screen *screen,
 
       { o(EXT_blend_equation_separate),      PIPE_CAP_BLEND_EQUATION_SEPARATE          },
       { o(EXT_depth_bounds_test),            PIPE_CAP_DEPTH_BOUNDS_TEST                },
+      { o(EXT_disjoint_timer_query),         PIPE_CAP_QUERY_TIMESTAMP                  },
       { o(EXT_draw_buffers2),                PIPE_CAP_INDEP_BLEND_ENABLE               },
       { o(EXT_memory_object),                PIPE_CAP_MEMOBJ                           },
       { o(EXT_memory_object_fd),             PIPE_CAP_MEMOBJ                           },