ART: Fix or disable some tidy warnings.

Add a strlcpy shim for the host, so we can use strlcpy instead of
strcpy everywhere.

Fixed warnings include unused-decls, (some) unreachable code, use
after std::move, string char append, leaks, (some) excessive padding.

Disable some warnings we cannot or do not want to avoid.

Bug: 32619234
Test: m
Test: m test-art-host
Change-Id: Ie191985eebb160d94b988b41735d4f0a1fa1b54e