I don't recommend using glue. Cyanoacryline won't be strong enough, and any other type will make You curse, if You ever need to repair anything again.

I would rather suggest to take very sharp screwdriver, hammer, and *gently* make new "row" inside part of screw, that remain inside. This way, you should be able to unscrew it.

Considering, that You're able to disassemble screen completely, You don't even need to be *very* gentle during that, as You don't risk punctuating screen.

/Estel