Use HAVE_ARC4RANDOM and choose to call arc4random() instead of srand()
and rand() and friends.

--- lib/sqlite/sqlite3.c.orig	Tue Nov 29 02:35:28 2016
+++ lib/sqlite/sqlite3.c	Thu Dec 15 11:29:38 2016
@@ -32221,7 +32221,11 @@ static int afpLock(sqlite3_file *id, int eFileLock){
     mask = (sizeof(long)==8) ? LARGEST_INT64 : 0x7fffffff;
     /* Now get the read-lock SHARED_LOCK */
     /* note that the quality of the randomness doesn't matter that much */
+#ifdef HAVE_ARC4RANDOM
+    lk = arc4random();
+#else
     lk = random(); 
+#endif
     pInode->sharedByte = (lk & mask)%(SHARED_SIZE - 1);
     lrc1 = afpSetLock(context->dbPath, pFile, 
           SHARED_FIRST+pInode->sharedByte, 1, 1);