[ MDVA-2008:024 ] - Updated rpmdrake packages fix various bu

[dude67]

Updated rpmdrake packages fix various bugs

This update fixes a crash when reading packages with an empty backport
media (#36720). This is a rare bug since DVD media did not include
backport media, and network media provides a non-empty backport media.

It also makes sure that a wait dialog always got destroyed (#36921).
Due to a bug, in some error cases, the dialog was not destroyed,
thus blocking the GUI until rpmdrake was closed.

Last but not least, it makes MandrivaUpdate ignore backport media
tagged as update (#36654).