git: update HTML docs world-readable version.

I checked this and it's still needed in 1.8.4.3.
Mac: add dev_tools_prefix method.

Basically dev_tools_path without the `/usr/bin`.
git: fix git-svn on 10.9.

Fixes #23587.
Closes #24686.
git: update 1.8.4.3 bottle.
lftp 4.4.13

Closes #24705.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>