Update vendor/libarchive/dist to git 809f0dc32fff7434aef45a7c688fa285c7208af7
Relevant vendor changes:
PR #1212: RAR5 reader - window_mask was not updated correctly
(OSS-Fuzz 15278)
OSS-Fuzz 15120: RAR reader - extend use after free bugfix
Add HAVE_UNLINKAT to config_freebsd.h