Re-enable TLS 1.[12] when building with OpenSSL >= 1.0.1e

To fix #6033, we disabled TLS 1.1 and 1.2.  Eventually, OpenSSL fixed
the bug behind #6033.

I've considered alternate implementations that do more testing to see
if there's secretly an OpenSSL 1.0.1c or something that secretly has a
backport of the OpenSSL 1.0.1e fix, and decided against it on the
grounds of complexity.
Merge remote-tracking branch 'public/bug6055_v2_024' into maint-0.2.4