add NetBSD/OpenBSD build support (except test/)

Fixes: https://github.com/alsa-project/alsa-lib/pull/250
Signed-off-by: SASANO Takayoshi <uaa@uaa.org.uk>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

src/pcm/pcm.c

@@ -660,7 +660,9 @@ playback devices.
 
 #include <stdio.h>
 #include <string.h>
+#if HAVE_MALLOC_H
 #include <malloc.h>
+#endif
 #include <stdarg.h>
 #include <signal.h>
 #include <ctype.h>

src/pcm/pcm_direct.c

@@ -44,12 +44,16 @@
  *
  */
  
+#if !defined(__OpenBSD__)
 union semun {
 	int              val;    /* Value for SETVAL */
 	struct semid_ds *buf;    /* Buffer for IPC_STAT, IPC_SET */
 	unsigned short  *array;  /* Array for GETALL, SETALL */
+#if defined(__linux__)
 	struct seminfo  *__buf;  /* Buffer for IPC_INFO (Linux specific) */
+#endif
 };
+#endif
  
 /*
  * FIXME:

src/pcm/pcm_mmap.c

@@ -20,7 +20,9 @@
 
 #include "config.h"
 #include <stdio.h>
+#if HAVE_MALLOC_H
 #include <malloc.h>
+#endif
 #include <string.h>
 #include <poll.h>
 #include <sys/mman.h>