r253680 in CURRENT breaks GH ports and maybe others

[Nikolai Lifanov]

r253680 enables SSL certificate verification for "fetch" command.
Ports use "fetch" to download distfiles.

At least all USE_GITHUB fetches are broken on CURRENT, and others might 
be too.

What is the correct/intended way to handle master sites that use bad SSL 
certificates?
Is there an intention to depend on a root certificate bundle after this?

=> Attempting to fetch 
https://codeload.github.com/vermaden/beadm/legacy.tar.gz/d7d7cd3?dummy=/beadm-0.8.99.20130730.tar.gz
Certificate verification failed for /C=US/O=DigiCert 
Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
34380834376:error:14090086:SSL 
routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify 
failed:/usr/src/secure/lib/libssl/../../../crypto/openssl/ssl/s3_clnt.c:1168:

- Nikolai Lifanov