x11-wm/river: respect WITH_PIE and STRIP (no WITH_DEBUG)
$ pkg info -s river
-river-0.2.2_1 3.88MiB
+river-0.2.2_2 534KiB
https://github.com/riverwm/river/commit/3cb6428da6bc
(cherry picked from commit 1406a61cc8134cf3a89b750f599c3f39f9833ad8)