follow-up 3

sys/share/cppregex.cpp

@@ -63,3 +63,13 @@ extern "C" {
     delete re;
   }
 }
+
+void
+regex_at_exit(void)
+{
+    if (cppregex_static_buffer != 0) {
+        free((genericptr_t) cppregex_static_buffer);
+        cppregex_static_buffer = (char *) 0;
+    }
+}
+

sys/share/pmatchregex.c

@@ -65,3 +65,9 @@ regex_free(struct nhregex *re)
         free((genericptr_t) re);
     }
 }
+
+void
+regex_at_exit(void)
+{
+}
+

sys/share/posixregex.c

@@ -104,3 +104,9 @@ regex_free(struct nhregex *re)
     regfree(&re->re);
     free(re);
 }
+
+void
+regex_at_exit(void)
+{
+}
+