Backported from the upstream CVS repository, see:
http://cvs.schmorp.de/rxvt-unicode/src/rxvtperl.h?r1=1.28&r2=1.29
http://cvs.schmorp.de/rxvt-unicode/src/rxvtperl.xs?r1=1.246&r2=1.247

--- rxvt-unicode/src/rxvtperl.h	2012/06/12 10:45:53	1.28
+++ rxvt-unicode/src/rxvtperl.h	2020/06/30 07:31:24	1.29
@@ -51,7 +51,9 @@
 {
   char **perl_environ;
 
+  #if 0 // see rxvtperl.xs
   ~rxvt_perl_interp ();
+  #endif
 
   void init ();
   void init (rxvt_term *term);
--- rxvt-unicode/src/rxvtperl.xs	2020/01/20 09:35:12	1.246
+++ rxvt-unicode/src/rxvtperl.xs	2020/06/30 07:31:24	1.247
@@ -372,6 +372,9 @@
 
 static PerlInterpreter *perl;
 
+#if 0 /* we are not a library anymore, so doing this is just not worth it */
+/*THINK/TODO: this has the side effect of, of course, not calling destructors. */
+/* but therse are not guaranteed anyway... */
 rxvt_perl_interp::~rxvt_perl_interp ()
 {
   if (perl)
@@ -381,6 +384,7 @@
       PERL_SYS_TERM ();
     }
 }
+#endif
 
 void
 rxvt_perl_interp::init ()
