Remove duplicate js_newerror prototype.
Remove duplicate js_newerror prototype.

guiquanz/mujs,BOGY/mujs,earthling42/mujs,evanlabs/mujs,ccxvii/mujs,ccxvii/mujs,Frky/mujs,thurday/mujs,ccxvii/mujs,lsm/mujs,ccxvii/mujs