winebrowser: Check for unicode in the buffer

[Jeff Latimer]

Where the client and the server both support unicode the buffer is 
copied by WDML_BuildExecuteCommand rather than converted.  In ths case 
we need to check to see if the buffer in unicode and if so copy it 
rather than convert it.

Jeff

---
  programs/winebrowser/main.c |   23 ++++++++++++++++++-----
  1 files changed, 18 insertions(+), 5 deletions(-)
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