systemd: allow AF_NETLINK when upnp is enabled

mpd.service will fail to start when mpd is configured with upnp database/neighbor plugin
and AF_NETLINK is not allowed in RestrictAddressFamilies=

Author: abouvier

NEWS

@@ -6,6 +6,7 @@ ver 0.24.13 (not yet released)
 * output
   - pipewire: fix file descriptor leak bug after connect failure
   - pipewire: support the "media.album" tag
+* systemd: allow AF_NETLINK when UPnP is enabled
 
 ver 0.24.12 (2026/05/15)
 * protocol

systemd/meson.build

@@ -2,7 +2,7 @@ systemd_unit_conf = configuration_data()
 systemd_unit_conf.set('prefix', get_option('prefix'))
 
 address_families = ['AF_INET', 'AF_INET6', 'AF_UNIX']
-if get_option('smbclient').enabled()
+if get_option('smbclient').enabled() or upnp_dep.found()
   # AF_NETLINK is required by libsmbclient, or it will exit() .. *sigh*
   address_families += 'AF_NETLINK'
 endif