archivers/libarchive: Update to 3.7.4

Backport follwing upstream commits:
b910cb70d4c1b311c9d85cd536a6c91647c43df7
83e8b0ea8c3b07e07ac3dee90a8724565f8e53fd

References:
https://github.com/libarchive/libarchive/commit/b910cb70d4c1b311c9d85cd536a6c91647c43df7
https://github.com/libarchive/libarchive/commit/83e8b0ea8c3b07e07ac3dee90a8724565f8e53fd

Changelog: https://github.com/libarchive/libarchive/releases/tag/v3.7.4
PR:		278795
Approved by:	portmgr (maintainer timeout, 2+ weeks)