Complete the VxWorks fix by implementing a NULL RAND_poll() for it.

PR: 253

crypto/rand/rand_egd.c

@@ -94,7 +94,7 @@
  *   RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
  */
 
-#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS)
+#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS)
 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
 	{
 	return(-1);

crypto/rand/rand_unix.c

@@ -236,3 +236,10 @@ int RAND_poll(void)
 }
 
 #endif
+
+#if defined(OPENSSL_SYS_VXWORKS)
+int RAND_poll(void)
+{
+    return 0;
+}
+#endif