Update unrar to 5.8.1
Summary:
Upstream doesn't know what a changelog is...
Signed-off-by: Pierre-Yves <pyu@riseup.net>
Test Plan:
- unrar x test.rar
- open the archive from file-roller
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Subscribers: JoshStrobl
Differential Revision: https://dev.getsol.us/D7059