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/syslog.cc

@@ -300,7 +300,7 @@ syslog (int priority, const char *message, ...)
 	      return;
 	  }
 
-	if (os_being_run != winNT)
+	if (!iswinnt)
 	  {
 	    /* Add a priority string - not needed for NT
 	       as NT has its own priority codes. */
@@ -336,7 +336,7 @@ syslog (int priority, const char *message, ...)
 
     msg_strings[0] = total_msg;
 
-    if (os_being_run == winNT)
+    if (iswinnt)
       {
 	/* For NT, open the event log and send the message */
 	HANDLE hEventSrc = RegisterEventSourceA (NULL, (process_ident != NULL) ?