2009-09-18 Ivan Maidanski <ivmai@mail.ru>

2009-09-18  Ivan Maidanski <ivmai@mail.ru>
	(ivmai142.diff)

	* include/private/gcconfig.h (GWW_VDB): Undefine if
	USE_GLOBAL_ALLOC (since incompatible).
	* os_dep.c (GetWriteWatch_alloc_flag): Define as 0 unless GWW_VDB
	is defined.
	* os_dep.c (GC_unmap_threshold): Declare (for use in
	GC_init_win32) if USE_MUNMAP.
	* os_dep.c (GC_init_win32): Turn off memory unmapping if
	GlobalAlloc() is used.
	* os_dep.c (GC_win32_get_mem): Define and use new
	VIRTUAL_ALLOC_PAD macro; don't waste a extra memory page unless
	MPROTECT_VDB is in use.