avahi: pkg-config is needed

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/avahi/avahi.mk

@@ -84,7 +84,7 @@ AVAHI_CONF_OPT = --localstatedir=/var \
 		--with-autoipd-user=default \
 		--with-autoipd-group=default
 
-AVAHI_DEPENDENCIES = $(if $(BR2_NEEDS_GETTEXT_IF_LOCALE),gettext libintl) host-intltool
+AVAHI_DEPENDENCIES = $(if $(BR2_NEEDS_GETTEXT_IF_LOCALE),gettext libintl) host-intltool host-pkg-config
 
 ifneq ($(BR2_PACKAGE_AVAHI_DAEMON)$(BR2_PACKAGE_AVAHI_AUTOIPD),)
 AVAHI_DEPENDENCIES += libdaemon