patch 8.2.0479: unloading shared libraries on exit has no purpose

Problem:    Unloading shared libraries on exit has no purpose.
Solution:   Do not unload shared libraries on exit.
diff --git a/src/if_perl.xs b/src/if_perl.xs
index 12e1a22..3af309a 100644
--- a/src/if_perl.xs
+++ b/src/if_perl.xs
@@ -762,7 +762,7 @@
 }
 
 /*
- * perl_end(): clean up after ourselves
+ * Clean up after ourselves.
  */
     void
 perl_end(void)
@@ -777,13 +777,6 @@
 	Perl_sys_term();
 #endif
     }
-#ifdef DYNAMIC_PERL
-    if (hPerlLib)
-    {
-	close_dll(hPerlLib);
-	hPerlLib = NULL;
-    }
-#endif
 }
 
 /*