LAUNCH: Give a different name to the launch caching thread for better identification

src/base/launch.c

@@ -239,6 +239,7 @@ ___check_kara(volatile sqlite3 *db)
 PRIVATE_FUNCTION void *
 ___caching_walker(void *args)
 {
+    lkt_thread_set_name("lektord/caching");
     volatile sqlite3 *db = (volatile sqlite3 *)args;
     ___cache_kara(db);
     ___check_kara(db);