Add static declaration `checkUserForeverCookie`
Add static declaration `checkUserForeverCookie`

Add static declaration to `User::checkUserForeverCookie()`


Former-commit-id: 71eb1ba1687419cc7c4d00efa049bc8a37289768
acliss19xx/concrete5,deek87/concrete5,rikzuiderlicht/concrete5,triplei/concrete5-8,KorvinSzanto/concrete5,haeflimi/concrete5,mlocati/concrete5,jaromirdalecky/concrete5,mainio/concrete5,haeflimi/concrete5,biplobice/concrete5,olsgreen/concrete5,triplei/concrete5-8,mlocati/concrete5,biplobice/concrete5,acliss19xx/concrete5,MrKarlDilkington/concrete5,biplobice/concrete5,a3020/concrete5,haeflimi/concrete5,deek87/concrete5,jaromirdalecky/concrete5,MrKarlDilkington/concrete5,concrete5/concrete5,hissy/concrete5,mainio/concrete5,triplei/concrete5-8,jaromirdalecky/concrete5,rikzuiderlicht/concrete5,hissy/concrete5,deek87/concrete5,a3020/concrete5,deek87/concrete5,mainio/concrete5,concrete5/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,concrete5/concrete5,olsgreen/concrete5,olsgreen/concrete5,biplobice/concrete5,acliss19xx/concrete5,KorvinSzanto/concrete5,mlocati/concrete5,concrete5/concrete5,hissy/concrete5,KorvinSzanto/concrete5,hissy/concrete5,mlocati/concrete5,jaromirdalecky/concrete5,MrKarlDilkington/concrete5