swrast-dri: Remove call to driInitExtensions

The only purpose this call served in the DRI swrast driver was to
initialize the remap table.  Core Mesa already does the dispatch
offset remapping for every function that could possibly ever be
supported.  There's no need to continue using that cruft in the
driver.

src/mesa/drivers/dri/swrast/swrast.c

@@ -695,8 +695,6 @@ dri_create_context(gl_api api,
         _mesa_enable_1_5_extensions(mesaCtx);
         _mesa_enable_2_0_extensions(mesaCtx);
         _mesa_enable_2_1_extensions(mesaCtx);
-
-        driInitExtensions( mesaCtx, NULL, GL_FALSE );
         break;
     case API_OPENGLES:
         _mesa_enable_1_3_extensions(mesaCtx);