Update to 1.10.99.5

• pkg clean is now happy if the cache dir non existing
• 410.pkg-audit now uses anticongestion on freebsd 12
• fix pkg install -r foo if foo is a disabled repository
• fix elf handling on non FreeBSD
• fix support for platforms without AT_SYMLINK_NOFOLLOW
• fix dropping privileges on Linux
• fix build with recent libbsd
• fix duplicate pkg registration overwriting the existing pkg
• better ABI name on linux
• lots of changes in internal API to use fd when possible
• removed option: pkg repo -L