Added xbps_repository_pkg_replaces() to handle pkg "replaces" in the transaction.

The frontend (in that case xbps-bin(8)) is only responsible to remove
those packages that have the "trans-action" string object set to "remove".

lib/repository_findpkg.c

@@ -183,6 +183,12 @@ repository_find_pkg(const char *pattern, const char *reason)
 		rv = EINVAL;
 		goto out;
 	}
+	/*
+	 * Check if this package should replace other installed packages.
+	 */
+	if ((rv = xbps_repository_pkg_replaces(transd, origin_pkgrd)) != 0)
+		goto out;
+
 	/*
 	 * Add the pkg dictionary from repository's index dictionary into
 	 * the "unsorted" array in transaction dictionary.