Make the 'z' flag of the "-c" command-line option work as it did in 06.00.00.

docs/WHATSNEW

@@ -9,9 +9,8 @@ CHANGES TO REMIND
   https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda
   for details.
 
-  NOTE INCOMPATIBILITY: $TerminalHyperlinks REPLACES the "z" flag of
-  the "-c" option (introduced in version 06.02.00), which will no
-  longer do anything.
+  For backward compatibility, the 'z' flag of the "-c" command-line
+  option sets $TerminalHyperlinks to 1.
 
 - NEW FEATURE: remind: Add another parameter to the "-w" option to
   remove blank lines between reminders, thereby making the calendar