package/libarchive: bump to version 3.5.1

Libarchive 3.5.1 is a bugfix release.

Update COPYRIGHT hash due to clarification about 'archive_entry.c' source
file:

 - https://github.com/libarchive/libarchive/commit/fde4660d7bda7debe8e6c8166d49fe9fa62db61d



Signed-off-by: Pierre-Jean Texier <texier.pj2@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>