Avoid unnormalized paths for CMake install destinations

CMake 3.31 is very noisy about our manpage (and to a lesser extend
documentation in general) building as we used "//" and "/../" there.

`cmake --help-policy CMP0177` documents the warning, so we could just
decide on a value and deal with it, but given our usage is not really
needed and rather trivial to change lets not pick a value and instead
use a normalized path so we don't use different code paths in CMake
depending on which CMake version we happen to be build with.

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