mesa/soft/llvmpipe: add fake MSAA support

This adds a gallium cap that allows us to fake GL3.0 by
not exposing MSAA on sw rendering.
It also forces the extra extensions needed for GL3.2.

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/drivers/softpipe/sp_screen.c

@@ -189,6 +189,8 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_GATHER_SM5:
    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
       return 0;
+   case PIPE_CAP_FAKE_SW_MSAA:
+      return 1;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAP %d query\n", param);