Include "file.h" where it's needed

Several headers define macros that use ef_ptr() without including
"file.h".  Fix that.  Drop redundant inclusions elsewhere.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

src/util/fairland.c

@@ -72,7 +72,6 @@ static int quiet = 0;
 #include <stdio.h>
 #include <unistd.h>
 #include "chance.h"
-#include "file.h"
 #include "optlist.h"
 #include "prototypes.h"
 #include "sect.h"