csfml 2.0 (new formula)

CSFML are the C bindings to the SFML library (already present in
Homebrew).
sfml: add 2.1 bottle.
csfml: add 2.0 bottle.

Closes #31762.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
csfml: improve test.
Tarsnap: Added Dependency

Transit requires OpenSSL. So far we’ve been linking Tarsnap to the
system-supplied OpenSSL. Doing so kind of sucks, because Apple *still*,
to my knowledge, hasn’t patched Mavericks for the vulnerabilities
disclosed in OpenSSL 0.9.8 and later fixed by 0.9.8za. We should stop
building software against the Apple provided OpenSSL generally, but
particularly for security software like Tarsnap.
tarsnap: add 1.0.35 bottle.