console-server: include poll.h

musl freaks out when including sys/poll.h, so include poll.h directly.

arm-linux-musleabi/sysroot/usr/include/sys/poll.h:1:2:
error: #warning redirecting incorrect #include <sys/poll.h> to <poll.h> [-Werror=cpp]
 #warning redirecting incorrect #include <sys/poll.h> to <poll.h>
  ^~~~~~~

Change-Id: Iad13ba2af242ab0708b327e68668a8739f555a1f
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/console-server.c b/console-server.c
index 9a0d60e..4d62d00 100644
--- a/console-server.c
+++ b/console-server.c
@@ -34,7 +34,7 @@
 #include <termios.h>
 
 #include <sys/types.h>
-#include <sys/poll.h>
+#include <poll.h>
 
 #include "console-server.h"