For example graphviz has chained symlinked manpages: dot2gxl.1 is
a symlink to gv2gxl.1 which is a symlink to gxl2gv.1
The second loop replaces each non-compressed symlink to a compressed
symlink. The target is determined with 'readlink -f', which follows
links recursively until the first name that is not a link (so either
the 'target name' or the first 'dangling' symlink).
This means that if the loop converted dot2gxl.1 before converting
gv2gxl.1 it would add a symlink `dot2gxl.1.gz->gxl2gv.1.gz`. When
it converted gv2gxl.1 first, it would then add a
`dot2gxl.1.gz->gv2gxl.1.gz` symlink.
Both are 'correct', but it's weird the result depends on the order
in which 'find' returns the files. This PR makes the behaviour
deterministic.
fixes#104708
Because of bash 4.4 the semantics GLOBIGNORE changed.
This resulted in already compressed manpages to be compressed twice.
Also be careful about symlinks to fix#21777, e.g. the ledger example.
