Fix gcc errors arising from latest commit (incomplete sight_map implementation) - #55

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keyspace:fix-gcc-errors

Commits on Jan 31, 2017

map: add `const` to `Sight_map::{is_initialised,can_see}()` implementations.
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e7bdfc9
map: add `build_tile_sight_map()` to header, bandage up its syntax.
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e59f1e9
map: fix typo: `may_y` -> `max_y`.
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feab6a7
map: minor, tag helper declaration in header as FIXME.
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10b0801