There's a merged pull request on the void-packages repository

libupnpp: update to 0.18.0
https://github.com/void-linux/void-packages/pull/18991

Description:
libupnpp 0.18+ defaults to building with libnpupnp instead of libupnp. See https://www.lesbonscomptes.com/upmpdcli/libnpupnp.html