package/libarchive: bump to version 3.4.0

Use a mirror download site.
https://github.com/libarchive/libarchive/issues/1216



Drop upstream patches.

Mention additional licenses for new RARv5 code. Update license file
hash.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>