Addressed more issues raised by splint.

src/include/config.h.in

@@ -79,6 +79,9 @@
 /* Define to 1 if you have the `memmove' function. */
 #undef HAVE_MEMMOVE
 
+/* Define to 1 if you have the `memrchr' function. */
+#undef HAVE_MEMRCHR
+
 /* Define to 1 if you have the `memset' function. */
 #undef HAVE_MEMSET
 

src/include/pv.h

@@ -88,6 +88,12 @@ extern size_t pv_strlcat(char *, const char *, size_t);
  */
 /*@null@ */ /*@only@ */ extern char *pv_strdup(const char *);
 
+/*
+ * Return a pointer to the last matching character in the buffer, or NULL if
+ * not found.
+ */
+/*@null@ */ /*@temp@ */ extern void *pv_memrchr(const void *, int, size_t);
+
 /*
  * Functions relating to elapsed time.
  */