File fix-openal-header.patch of Package flightgear

--- a/3rdparty/iaxclient/lib/audio_openal.h
+++ b/3rdparty/iaxclient/lib/audio_openal.h
@@ -1,5 +1,6 @@
 #ifndef AUDIO_OPENAL_H
 #define AUDIO_OPENAL_H

-int openal_initialize();
+struct iaxc_audio_driver;
+int openal_initialize(struct iaxc_audio_driver *d, int sample_rate);

 #endif