[cairo] Sign of cairo_font_extents->descent

[Owen Taylor]

I just discovered that the FreeType and Win32 font backends don't agree
on the sign of cairo_font_extents->descent.

 FreeType backend: a font that descends below the baseline has  a 
   negative descent

   (Like in the FreeType API)

 Win32 backend: a font that descends below the baseline as a 
   positive descent

   (Like Xft, Pango, Windows, ATSUI APIs)

I'd suggest we change the FreeType backend.

Regards,
						Owen

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