Fedora 18 changes the way how to work with services in spec files. It introduces new macros - %systemd_post, %systemd_preun and %systemd_postun; which replace scriptlets from Fedora 17 and older (see https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Systemd, https://bugzilla.redhat.com/show_bug.cgi?id=850016).
Got a patch?
Not yet
Fixed in http://pkgs.fedoraproject.org/cgit/bluez.git/commit/?id=4a28461fe175610657ed41845e67a52445c2f51a