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

man/remind.1.in

@@ -102,6 +102,10 @@ flag also enables the use of the UNICODE "left-to-right" mark that
 can fix up formatting problems with right-to-left languages in the calendar
 display.
 .TP
+.B 'z'
+has the effect of setting the system variable \fB$TerminalHyperlinks\fR
+to 1.  See the documentation of this variable in the section "SYSTEM VARIABLES"
+.TP
 .B 'c'
 causes \fBRemind\fR to use VT100 escape sequences to approximate
 SPECIAL COLOR reminders.  Note that this flag is kept for

src/init.c

@@ -514,6 +514,11 @@ void InitRemind(int argc, char const *argv[])
                         arg++;
                         continue;
                     }
+                    if (*arg == 'z' || *arg == 'Z') {
+                        TerminalHyperlinks = 1;
+                        arg++;
+                        continue;
+                    }
                     if (*arg == 'c' || *arg == 'C') {
                         UseVTColors = 1;
                         arg++;

tests/test-rem

@@ -970,9 +970,8 @@ REM 17 INFO "Url: https://dianne.skoll.ca" CAL Hello, linky!
 REM 18 INFO "Url: https://dianne.skoll.ca" SPECIAL COLOR 255 0 0 Hello, linky!
 EOF
 
-# Turn off spacing between reminders..
-$REMIND -w,0,0,0 -@2 -c - 1 Jan 2020 <<'EOF' >> $OUT 2>&1
-SET $TerminalHyperlinks 1
+# Turn off spacing between reminders, and test the 'z' -c flag.
+$REMIND -w,0,0,0 -@2 -cz - 1 Jan 2020 <<'EOF' >> $OUT 2>&1
 REM 15 INFO "Url: https://dianne.skoll.ca" MSG Hello, linky 1!
 REM 15 INFO "Url: https://dianne.skoll.ca" MSF Hello, linky 2!
 REM 15 INFO "Url: https://dianne.skoll.ca" CAL Hello, linky 3!