Switch to limits.h; replace MAXPATHLEN and MAXHOSTNAMELEN with PATH_MAX

and HOST_NAME_MAX+1, respectively.

ok doug@

calmwm.c

@@ -18,13 +18,14 @@
  * $OpenBSD$
  */
 
-#include <sys/param.h>
+#include <sys/types.h>
 #include <sys/queue.h>
 #include <sys/wait.h>
 
 #include <err.h>
 #include <errno.h>
 #include <getopt.h>
+#include <limits.h>
 #include <locale.h>
 #include <pwd.h>
 #include <signal.h>