Don't quit on ERROR_IO_INCOMPLETE. Closes #1372

CHANGELOG

@@ -1,5 +1,8 @@
 #Nmap Changelog ($Id$); -*-text-*-
 
+o [Ncat][GH#1372] Fixed an issue with Ncat -e on Windows that caused early
+  termination of connections. [Alberto Garcia Illera]
+
 o [GH#1361] Deprecate and disable the -PR (ARP ping) host discovery option. ARP
   ping is already used whenever possible, and the -PR option would not force it
   to be used in any other case. [Daniel Miller]

ncat/ncat_exec_win.c

@@ -547,10 +547,14 @@ static DWORD WINAPI subprocess_thread_func(void *data)
             } else {
                 /* Probably read result wasn't ready, but we got here because
                  * there was data on the socket. */
-                if (GetLastError() != ERROR_IO_PENDING)
-                {
-                    /* Error or end of file. */
-                    goto loop_end;
+                switch (GetLastError()) {
+                    case ERROR_IO_PENDING:
+                    case ERROR_IO_INCOMPLETE:
+                        break;
+                    default:
+                        /* Error or end of file. */
+                        goto loop_end;
+                        break;
                 }
             }
             /* Break here, don't go on. Need to finish all socket writes before