Add debug logger showing the glyph name for which gvar is built 
Add debug logger showing the glyph name for which gvar is built 

When building gvar, some situations cause fontmake/varLib to fail, for example if a component has a coordinate that's >32k or <-32k. This adds a debug line that prints each glyph name for which gvar is built, so it’s easier to pinpoint where the faulty glyph is.
fonttools/fonttools,googlefonts/fonttools