windows: add missing file flags to types

The previous selection was a bit haphazard, and defining random
constants in an application and combining those with existing constants
in this library looks kind of weird. So instead let's add the actual set
of flags, instead of the strange prior assortment.

Change-Id: I6ca266cd80aa7a43e93e969e1dbb09c8c7bf12c7
Reviewed-on: https://go-review.googlesource.com/c/sys/+/168520
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

windows/types_windows.go

@@ -126,9 +126,19 @@ const (
 	OPEN_ALWAYS       = 4
 	TRUNCATE_EXISTING = 5
 
-	FILE_FLAG_OPEN_REPARSE_POINT = 0x00200000
-	FILE_FLAG_BACKUP_SEMANTICS   = 0x02000000
-	FILE_FLAG_OVERLAPPED         = 0x40000000
+	FILE_FLAG_OPEN_REQUIRING_OPLOCK = 0x00040000
+	FILE_FLAG_FIRST_PIPE_INSTANCE   = 0x00080000
+	FILE_FLAG_OPEN_NO_RECALL        = 0x00100000
+	FILE_FLAG_OPEN_REPARSE_POINT    = 0x00200000
+	FILE_FLAG_SESSION_AWARE         = 0x00800000
+	FILE_FLAG_POSIX_SEMANTICS       = 0x01000000
+	FILE_FLAG_BACKUP_SEMANTICS      = 0x02000000
+	FILE_FLAG_DELETE_ON_CLOSE       = 0x04000000
+	FILE_FLAG_SEQUENTIAL_SCAN       = 0x08000000
+	FILE_FLAG_RANDOM_ACCESS         = 0x10000000
+	FILE_FLAG_NO_BUFFERING          = 0x20000000
+	FILE_FLAG_OVERLAPPED            = 0x40000000
+	FILE_FLAG_WRITE_THROUGH         = 0x80000000
 
 	HANDLE_FLAG_INHERIT    = 0x00000001
 	STARTF_USESTDHANDLES   = 0x00000100