MFC r357420: Remove unused include.

svn path=/stable/12/; revision=357992

bin/pwait/pwait.c

@@ -41,7 +41,6 @@ __FBSDID("$FreeBSD$");
 
 #include <err.h>
 #include <errno.h>
-#include <fcntl.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>