The build system offers no option to en-/disable libcap support:
http://git.0pointer.net/avahi.git/tree/configure.ac#n382
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Thomas: make the test unconditionally, even if libcap is only used by
avahi-daemon for the moment.] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>