Fix index-out-of-range in luaO_chunkid
Fix index-out-of-range in luaO_chunkid

If the string exceeds 60 characters, luaO_chunkid will call strcat
on a non-NUL-terminated string, overflowing the buffer.

Stevie-O/SharpLua,Stevie-O/SharpLua,Stevie-O/SharpLua