Bug #34114909 Fix compiler warnings from clang on Windows [noclose]

The patch for
    WL#15130 Socket-level TLS patch mysql#1: class NdbSocket
re-introduced a -Wcast-qual warning.

Use const_cast, and reinterpret_cast to fix it, since the corresponding
posix version of ndb_socket_writev() is const-correct.

Change-Id: Ib446a926b4108edf51eda7d8fd27ada560b67a24

Author: Tor Didriksen

storage/ndb/include/portlib/ndb_socket_win32.h

@@ -125,7 +125,9 @@ static inline
 ssize_t ndb_socket_writev(ndb_socket_t s, const struct iovec *iov, int iovcnt)
 {
   DWORD rv=0;
-  if (WSASend(s.s,(LPWSABUF)iov,iovcnt,&rv,0,0,0) == SOCKET_ERROR)
+  if (WSASend(s.s,
+              reinterpret_cast<LPWSABUF>(const_cast<struct iovec *>(iov)),
+              iovcnt, &rv, 0, 0, 0) == SOCKET_ERROR)
     return -1;
   return rv;
 }