hooks/pre-pkg/05-prepare-32bit.sh: fix symlinks
hooks/pre-pkg/05-prepare-32bit.sh: fix symlinks

If lib32symlinks contains plain library names without a path as in
the case of glibc (lib32symlinks="ld-linux.so.2") the expression
${f%/*} is not empty, but returns the basename.
Handle that case by verifying that ${f%/*} is different from ${f}.

Signed-off-by: Jürgen Buchmüller <2642204b262fe30d9fcde46ee57f8ed7ac19ed92@t-online.de>

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages