Throughout, change check for running under Windows NT to 'iswinnt'.

* dcrt0.cc (set_os_type): Set 'iswinnt' appropriately.
* cygheap.cc (init_cheap): Revert to using VirtualAlloc for allocating cygheap.
(cygheap_setup_for_child_cleanup): New function.  Standard function to call
after calling CreateProcess to cleanup cygheap info passed to child.
(cygheap_fixup_in_child): Copy cygheap from shared memory into allocated space
under Windows 9x or if can't relocate shared space under NT.
* cygheap.h: Declare new function.
* spawn.cc (spawn_guts): Use cygheap_fixup_in_child.
* fork.cc (fork_parent): Ditto.
* winsup.h: Declare iswinnt.

winsup/cygwin/environ.cc

@@ -658,7 +658,7 @@ environ_init (char **envp, int envc)
 
 #ifdef NTSEC_ON_BY_DEFAULT
   /* Set ntsec explicit as default, if NT is running */
-  if (os_being_run == winNT)
+  if (iswinnt)
     allow_ntsec = TRUE;
 #endif