oleaut32: Clean up IFontDisp::Invoke by using VariantChangeTypeEx to coerce the input parameter into the correct type.

[Robert Shearman]

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  dlls/oleaut32/olefont.c       |  235 
++++++++++++++++++++---------------------
  dlls/oleaut32/tests/olefont.c |   24 ++++
  2 files changed, 135 insertions(+), 124 deletions(-)
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