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/winsup.h

@@ -65,6 +65,7 @@ extern "C" DWORD WINAPI GetLastError (void);
 /* Used for runtime OS check/decisions. */
 enum os_type {winNT = 1, win95, win98, winME, win32s, unknown};
 extern os_type os_being_run;
+extern bool iswinnt;
 
 enum codepage_type {ansi_cp, oem_cp};
 extern codepage_type current_codepage;