3ds: use std::thread, Channels use std::recursive_mutex

include/objects/channel/channel.hpp

@@ -53,8 +53,8 @@ namespace love
         uint64_t sent;
         uint64_t received;
 
-        love::mutex mutex;
-        love::conditional condition;
+        love::recursive_mutex mutex;
+        love::condvar_any condition;
 
         std::queue<Variant> queue;
     };

include/utilities/threads/threads.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <condition_variable>
+#include <mutex>
+#include <thread>
+
+namespace love
+{
+    using mutex           = std::mutex;
+    using conditional     = std::condition_variable;
+    using thread          = std::thread;
+    using recursive_mutex = std::recursive_mutex;
+    using condvar_any     = std::condition_variable_any;
+} // namespace love