ALSA: uapi: Make alsa asound.h header more portable

This header is used as-is in the alsa-lib userland library,
which is portable to other operating systems.
For this reason, include linux/types.h only on Linux systems.

Add sys/ioctl.h for _IOR/_IOW/etc. (works at least on *BSD and Solaris).

Signed-off-by: Thomas Klausner <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

include/uapi/sound/asound.h

···
 #ifndef _UAPI__SOUND_ASOUND_H
 #define _UAPI__SOUND_ASOUND_H
 
+#if defined(__KERNEL__) || defined(__linux__)
 #include <linux/types.h>
+#else
+#include <sys/ioctl.h>
+#endif
 
 #ifndef __KERNEL__
 #include <stdlib.h>