do not highlight built-in function if not followed by '('
do not highlight built-in function if not followed by '('

Name of built-in function is not reserved word in Go, and you can
use it as variable name. "new" is often used as local variable, for
instance.

This patch is to apply font-lock-builtin-face only when built-in
function name is followed by '(', so that it doesn't highlight
non-function variable that happen to have the same name as built-in
function.

emacsmirror/go-mode,artemave/go-mode.el,dominikh/go-mode.el,gorakhargosh/go-mode.el,magastzheng/go-mode.el,tjyang/go-mode.el,kimiby/go-mode.el,codemac/go-mode.el,ibukanov/go-mode.el