gdi: Add header for GetCharABCWidthI

[Jeff L]

This add the the headers for GetCharABCWidthsI.  Like similar functions, 
this one will be implemented by  the WineEngGetCharABCWidthsI function.  
There is no A or W suffix for this function as it works from a glyph 
rather than a char.

Change log:
Add headers for GetCharABCWidthsI and WineEngGetCharABCWidthsI.

Jeff Latimer
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