builder: really remove bundled pyopenssl
builder: really remove bundled pyopenssl

Commit 366bd6f7 was supposed to remove the bundled pyopenssl dir.
I noticed in the output from script/licenses.sh that
pyOpenSSL-0.13.1/LICENSE was still present.

Therefore do a case-insensitive removal.

jumanjiman/docker-duoauthproxy,jumanjihouse/docker-duoauthproxy