Fix ziplist length updates on bigendian platforms (#2080)

Adds call to intrev16ifbe to ensure ZIPLIST_LENGTH is compared correctly

(cherry picked from commit eaa52719a355c4467d0383c1c9f5184c9c14fe5a)

src/ziplist.c

@@ -263,7 +263,7 @@
  * to stay there to signal that a full scan is needed to get the number of
  * items inside the ziplist. */
 #define ZIPLIST_INCR_LENGTH(zl,incr) { \
-    if (ZIPLIST_LENGTH(zl) < UINT16_MAX) \
+    if (intrev16ifbe(ZIPLIST_LENGTH(zl)) < UINT16_MAX) \
         ZIPLIST_LENGTH(zl) = intrev16ifbe(intrev16ifbe(ZIPLIST_LENGTH(zl))+incr); \
 }