8202052: Disable warnings when building libawt with VS2017
Reviewed-by: erikj, prr
SyntaxError:33:Expected property id but found ,
({,})
^
SyntaxError:33:Expected property id but found ,
({, a:2 })
^
SyntaxError:33:Expected property id but found ,
({a:3,,})
^
SyntaxError:33:Expected comma but found ident
({a:3 b:2}
^