pcm: drop unused sys/shm.h inclusion

This header isn't used in these files, so stop trying to include it.
This helps builds on systems that don't provide the header (such as
Android/Bionic).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

src/pcm/pcm.c

@@ -635,7 +635,6 @@ playback devices.
 #include <signal.h>
 #include <ctype.h>
 #include <sys/poll.h>
-#include <sys/shm.h>
 #include <sys/mman.h>
 #include <limits.h>
 #include "pcm_local.h"

src/pcm/pcm_generic.c

@@ -26,7 +26,6 @@
  *
  */
 
-#include <sys/shm.h>
 #include <sys/ioctl.h>
 #include <limits.h>
 #include "pcm_local.h"

src/pcm/pcm_hw.c

@@ -36,7 +36,6 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
-#include <sys/shm.h>
 #include "pcm_local.h"
 #include "../control/control_local.h"
 #include "../timer/timer_local.h"

src/pcm/pcm_null.c

@@ -28,7 +28,6 @@
   
 #include <byteswap.h>
 #include <limits.h>
-#include <sys/shm.h>
 #include "pcm_local.h"
 #include "pcm_plugin.h"
 

src/pcm/pcm_plugin.c

@@ -82,7 +82,6 @@ pcm.rate44100Hz {
 
 */
   
-#include <sys/shm.h>
 #include <limits.h>
 #include "pcm_local.h"
 #include "pcm_plugin.h"

src/pcm/pcm_share.c

@@ -35,7 +35,6 @@
 #include <math.h>
 #include <sys/socket.h>
 #include <sys/poll.h>
-#include <sys/shm.h>
 #include <pthread.h>
 #include "pcm_local.h"