Description of problem:
The current libidn package contains /sbin/ldconfig calls but the one
for uninstallation is run in preun when the libraries are still
present instead of during postun.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. rpm -q --scripts libidn-0.5.4
(and other info related stuff which is fine)
The install-info --delete call needs to stay in preun since it needs
to info file to still be present.