* external.cc (check_ntsec): New function.

(cygwin_internal): Add CW_CHECK_NTSEC handling to call check_ntsec() from
applications.
* include/cygwin/version.h: Bump API minor number.
* include/sys/cygwin.h (cygwin_getinfo_types): Add CW_CHECK_NTSEC.
* cygthread.cc (cygthread::new): Add more defensive debugging.

winsup/cygwin/cygthread.cc

@@ -141,6 +141,8 @@ new (size_t)
 #ifdef DEBUGGING
 	if (info->__name)
 	  api_fatal ("name not NULL? id %p, i %d", id, info - threads);
+	if (!info->h)
+	  api_fatal ("h not set? id %p, i %d", id, info - threads);
 #endif
 	goto out;
       }