tile.h: move #include <sys/mman.h> into tile.c

tile.h is included by a large part of the project, but the definitions
in sys/mman.h are only needed by the implementation code inside tile.c
so this reduces project wide include dependencies.

tiles/tile.c

@@ -23,6 +23,9 @@ static const char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magi
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
 
 #include "utils/magic.h"
 #include "utils/malloc.h"

tiles/tile.h

@@ -76,8 +76,6 @@ typedef struct tile
      */
 
 #ifdef HAVE_SYS_MMAN_H
-#include <sys/mman.h>
-#include <unistd.h>
 
 /* This is an on-demand Free List management */
 typedef Tile *TileStore;