We were previously using an old version of the Mozilla updater before they
added Mozilla signature verification, but it's Intel-only, so we need to build
our own version of the current updater with signature verification disabled.
Follow-up from f6fc14f7
Newline handling in Git 2.7.2 on Windows seems totally broken to me --
if I have core.autocrlf set to true but .gitattributes has
"* text=auto", text files with Unix newlines get converted to CRLF,
which seems contrary to all documentation I can find. In any case, this
is probably only an issue for SQL files (and only because of one regexp
that I'm too stubborn to change), and we don't generally have Windows
users committing new files, so can limit this to SQL for now.
