fix thread-start issue discovered by Damon Earp

ChangeLog

@@ -1,3 +1,7 @@
+Sat 26 Sep 2020 08:18:02 PM CEST
+    Make MHD_USE_NO_LISTEN_SOCKET work in conjunction with
+    MHD internal threads. -CG/DE
+
 Fri 11 Sep 2020 10:08:22 PM CEST
     Fix crash problem in PostProcessor reported by MD. -CG
     Fix GnuTLS configure test to check for gnutls_record_uncork. -CG

src/include/microhttpd.h

@@ -132,7 +132,7 @@ typedef intptr_t ssize_t;
  * Current version of the library.
  * 0x01093001 = 1.9.30-1.
  */
-#define MHD_VERSION 0x00097103
+#define MHD_VERSION 0x00097104
 
 /**
  * Operational results from MHD calls.

src/microhttpd/daemon.c

@@ -6427,7 +6427,8 @@ MHD_start_daemon_va (unsigned int flags,
 #endif /* HTTPS_SUPPORT */
 #if defined(MHD_USE_POSIX_THREADS) || defined(MHD_USE_W32_THREADS)
   if ( (0 != (*pflags & MHD_USE_INTERNAL_POLLING_THREAD)) &&
-       (0 == (*pflags & MHD_USE_NO_LISTEN_SOCKET)) )
+       ( (0 == (*pflags & MHD_USE_NO_LISTEN_SOCKET)) ||
+         (MHD_ITC_IS_VALID_ (daemon->itc)) ) )
   {
     if (0 == daemon->worker_pool_size)
     {