Quickfix opens luac binary

Steps to reproduce:
1) `let g:lua_compiler_name = '/usr/sbin/luac5.1'`
2) `touch test.lua; vim test.lua`
3) write smth like `abc=123`
4) `:LuaCheckGlobals`
5) press [Enter]

expected result:
jump to `test.lua:1`

actual result:
`/usr/sbin/luac5.1` binary loaded into the new buffer
