linkers: fix rpath padding calculation for non-ascii

rpaths are calculated in bytes, and that's also how depfixer processes
them. We need to ensure that the ascii padding we use (bytes == unicode)
is the correct offset for the install rpath - build rpath (both
specified in unicode which then gets converted to bytes).

In the event of a unicode install_rpath, we can get into a situation
where the install rpath is longer than the padding, since we assumed
that the install_rpath was shorter than it actually is -- because we
counted the length in characters instead of the length in bytes.

This then broke installation for people who e.g. install into a prefix
inside their home directory, when their home directory contains
multibyte unicode characters.

Bug: https://gitlab.gnome.org/GNOME/gnome-builder/-/issues/2280

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