auto-patchelf: don't resolve symlinks if basenames don't match

The auto-patchelf python script assembles a list of
library (so=shared object) file names and their paths.
This helps speed up the discovery of
library files later when patching elf files.
As further optimization, if a symlink points to a library file,
the script uses the resolved path and file name.
However, this produces a broken list entry if the
symlink's target name doesn't match the symlink's name.

A symptom of the bug, affecting the `tsm-client` package,
is fixed in https://github.com/NixOS/nixpkgs/pull/172372 .

The commit at hand stops resolving symlinks if
the target name differs from the symlink's name.
The commit has been authored by
layus (Guillaume Maudoux <layus.on@gmail.com>)
in pull request comment

https://github.com/NixOS/nixpkgs/pull/172372#issuecomment-1194687183

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