dispex: Use the upper WORD of the flags parameter to indicate whether the optional [out] parameters are NULL.

[Huw Davies]

The exact bit values were found by examining the data pushed onto the wire using the native version.
---
 dlls/dispex/tests/marshal.c |    3 ---
 dlls/dispex/usrmarshal.c    |   32 ++++++++++++++++++++------------
 2 files changed, 20 insertions(+), 15 deletions(-)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 96ee290fb789add84a5d81756a3f342fce24ffd3.diff
Type: text/x-patch
Size: 3356 bytes
Desc: not available
URL: <http://www.winehq.org/pipermail/wine-patches/attachments/20100319/4fbc2c03/attachment.bin>