use sys/soundcard.h for OSS audio

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@607 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libav/audio.c

@@ -21,7 +21,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include <linux/soundcard.h>
+#include <sys/soundcard.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>