fix build error

[sheerluck]

Error: type mismatch: got <Mode, cint>

[OldhamMade]

Hey @sheerluck, thanks for submitting this PR. Unfortunately, it seems to be failing on Travis-CI so I'm not able to merge:

... /home/travis/build/OldhamMade/ll/src/ll.nim(155, 9) Error: type mismatch: got <Mode, uint64>
... but expected one of: 
... proc `and`(x, y: int32): int32
...   first type mismatch at position: 2
...   required type: int32
...   but expression 'uint64(1024)' is of type: uint64
... proc `and`(x, y: int64): int64
...   first type mismatch at position: 2
...   required type: int64
...   but expression 'uint64(1024)' is of type: uint64
... proc `and`(x, y: int): int
...   first type mismatch at position: 2
...   required type: int
...   but expression 'uint64(1024)' is of type: uint64

[OldhamMade]

Builds fine locally. I'm merging, and will replace TravisCI with GitHub actions soon.