- Remove the cloog.info that is in the tarball That forces the regeneration
of a new cloog.info with suitable INFO_DIR_SECTION, so that
install-info doesn't cry at install time.
- Slightly changed the patch to make install-info actually install the
cloog information in the info directory file.
- Run install-info --delete in %preun, not in %postun, otherwise the info
file is long gone with we try to run install-info --delete on it.