glsl: enable OVR_multiview if OVR_multiview2 is enabled

according to spec

Fixes: 328c29d600 ("mesa,glsl,gallium: add GL_OVR_multiview")

Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32946>

src/compiler/glsl/glsl_parser_extras.cpp

@@ -1031,6 +1031,9 @@ _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
       }
    }
 
+   if (state->OVR_multiview2_enable)
+      state->OVR_multiview_enable = true;
+
    return true;
 }