Add OpenAL-soft 29e0af5ef052a3602f9b7935d6002c6d2ae5e8cb.

Needed because of race condition fix in mmdevapi backend.

libs/openal-soft-1.15.1-29e0af5ef052/Alc/evtqueue.h

@@ -0,0 +1,31 @@
+#ifndef AL_EVTQUEUE_H
+#define AL_EVTQUEUE_H
+
+#include "AL/al.h"
+
+#include "alMain.h"
+
+typedef struct MidiEvent {
+    ALuint64 time;
+    ALuint event;
+    union {
+        ALuint val[2];
+        struct {
+            ALvoid *data;
+            ALsizei size;
+        } sysex;
+    } param;
+} MidiEvent;
+
+typedef struct EvtQueue {
+    MidiEvent *events;
+    ALsizei pos;
+    ALsizei size;
+    ALsizei maxsize;
+} EvtQueue;
+
+void InitEvtQueue(EvtQueue *queue);
+void ResetEvtQueue(EvtQueue *queue);
+ALenum InsertEvtQueue(EvtQueue *queue, const MidiEvent *evt);
+
+#endif /* AL_EVTQUEUE_H */