xbps_init() now sets rootdir, cachedir and flags.

That means that the following functions were removed:
	- xbps_set_{cachedir,flags,rootdir}.
	- xbps_get_{cachedir,flags,rootdir}.

With this change fixed an obvious typo that made -c argument to not work,
and now the cache directory is an absolute path not relative to rootdir.

lib/package_requiredby.c

@@ -103,13 +103,15 @@ remove_pkg_from_reqby(prop_object_t obj, void *arg, bool *loop_done)
 int HIDDEN
 xbps_requiredby_pkg_remove(const char *pkgname)
 {
+	const struct xbps_handle *xhp;
 	prop_dictionary_t dict;
 	char *plist;
 	int rv = 0;
 
 	assert(pkgname != NULL);
 
-	plist = xbps_xasprintf("%s/%s/%s", xbps_get_rootdir(),
+	xhp = xbps_handle_get();
+	plist = xbps_xasprintf("%s/%s/%s", xhp->rootdir,
 	    XBPS_META_PATH, XBPS_REGPKGDB);
 	if (plist == NULL)
 		return ENOMEM;