make go-cairo compile with cairo versions older than 1.16 #31
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The function
SVGSurfaceSetDocumentUnitdoesn't work with Cairo older than version 1.16, because it didn't have the functioncairo_svg_surface_set_document_unit. This caused compiling ofgo-cairoto fail.This update adds a do-nothing implementation of
cairo_svg_surface_set_document_unitif the detected version of Cairo is older than 1.16.