Fix audaspace mess in 2.8

All these files were removed since accidental commit, revert and merge in 2.8.

ea31f0ac3b + 0a4e170c28 + 11f9a23a28 + 7b27b10fa6

extern/audaspace/include/util/ILockable.h

@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file ILockable.h
+ * @ingroup util
+ * The ILockable interface.
+ */
+
+#include "Audaspace.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * @interface ILockable
+ * This class provides an interface for lockable objects.
+ */
+class AUD_API ILockable
+{
+public:
+	/**
+	 * Locks the object.
+	 */
+	virtual void lock()=0;
+	/**
+	 * Unlocks the previously locked object.
+	 */
+	virtual void unlock()=0;
+};
+
+AUD_NAMESPACE_END