Adjust more included headers to be compatible with the musl C

library.  Patch from Matias A. Fonzo and Dragora.

src/consoles.c

@@ -28,6 +28,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
+#include <sys/ttydefaults.h>
 #ifdef __linux__
 #  include <sys/vt.h>
 #  include <sys/kd.h>

src/last.c

@@ -28,7 +28,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/fcntl.h>
+#include <fcntl.h>
 #include <time.h>
 #include <stdio.h>
 #include <ctype.h>

src/wall.c

@@ -29,6 +29,7 @@
 #include <unistd.h>
 #include <pwd.h>
 #include <syslog.h>
+#include <sys/types.h>
 #include "init.h"