ole32: Add HICON user marshalling stubs

[Michael Karcher]

Needed for shell32 proxying in actxprxy.dll. This is just copy/paste
from the stubs for HBITMAP.
---
 dlls/ole32/ole32.spec   |    4 ++
 dlls/ole32/usrmarshal.c |   99 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+), 0 deletions(-)
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