Various fixes for better OpenBSD compatibility (thanks to Jacob Meuser)

(cherry picked from commit 46097b72d7)

Conflicts:

	src/core/main.cpp

src/core/audio/audio_oss.cpp

@@ -3,7 +3,7 @@
 /*
  * audio_oss.cpp - device-class that implements OSS-PCM-output
  *
- * Copyright (c) 2004-2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ * Copyright (c) 2004-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
  * 
  * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
  *
@@ -56,7 +56,7 @@
 #ifdef LMMS_HAVE_SYS_SOUNDCARD_H
 // This is recommended by OSS
 #include <sys/soundcard.h>
-#elif LMMS_HAVE_SOUNDCARD_H
+#elif defined(LMMS_HAVE_SOUNDCARD_H)
 // This is installed on some systems
 #include <soundcard.h>
 #endif

src/core/main.cpp

@@ -50,6 +50,10 @@
 #include <process.h>
 #endif
 
+#ifdef LMMS_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #include "config_mgr.h"
 #include "embed.h"
 #include "engine.h"
@@ -345,6 +349,7 @@ int main( int argc, char * * argv )
 	// try to set realtime priority
 #ifdef LMMS_BUILD_LINUX
 #ifdef LMMS_HAVE_SCHED_H
+#ifndef __OpenBSD__
 	struct sched_param sparam;
 	sparam.sched_priority = ( sched_get_priority_max( SCHED_FIFO ) +
 				sched_get_priority_min( SCHED_FIFO ) ) / 2;
@@ -353,6 +358,7 @@ int main( int argc, char * * argv )
 		printf( "Notice: could not set realtime priority.\n" );
 	}
 #endif
+#endif
 #endif
 
 	configManager::inst()->loadConfigFile();