- Remove times.h from C programs that does not manipulate with time at

all.
 - Remove pathnames.h from all but io.c since it's the only module that
   used these definations.

usr.bin/calendar/calendar.c

@@ -55,7 +55,6 @@ __FBSDID("$FreeBSD$");
 #include <time.h>
 #include <unistd.h>
 
-#include "pathnames.h"
 #include "calendar.h"
 
 struct passwd	*pw;

usr.bin/calendar/day.c

@@ -44,7 +44,6 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 #include <time.h>
 
-#include "pathnames.h"
 #include "calendar.h"
 
 struct tm		*tp;

usr.bin/calendar/ostern.c

@@ -30,7 +30,6 @@ __FBSDID("$FreeBSD$");
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <time.h>
 
 #include "calendar.h"
 

usr.bin/calendar/paskha.c

@@ -30,7 +30,6 @@ __FBSDID("$FreeBSD$");
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <time.h>
 
 #include "calendar.h"