Rename property in conf file for virtual packages to "virtual-packages".

etc/xbps-conf.plist

@@ -38,7 +38,7 @@
 	</array>
 
 	<!-- Virtual packages -->
-	<key>package-virtual</key>
+	<key>virtual-packages</key>
 	<array>
 		<!-- This dictionary sets that we _always_ want
 		     the "dcron" package to be the default cron-daemon

lib/plist_find.c

@@ -177,7 +177,7 @@ find_virtualpkg_user_in_conf(const char *vpkg, bool bypattern)
 		return NULL;
 
 	if ((iter = xbps_array_iter_from_dict(xhp->conf_dictionary,
-	    "package-virtual")) == NULL)
+	    "virtual-packages")) == NULL)
 		return NULL;
 
 	while ((obj = prop_object_iterator_next(iter)) != NULL) {