[COMMITTED] Prefer https for Sourceware links

[Rical Jasan]

On 11/15/2017 10:37 PM, Siddhesh Poyarekar wrote:
> Update all sourceware links to https.  The website redirects
> everything to https anyway so let the web server do a bit less work.

Thank you.  www.gnu.org does the same, which I noticed wasn't touched.
Are there plans to update those URLs at some point?  From some related
discussion on bug-standards, my understanding is that this type of
change was acceptable, with some concerns about ensuring all the
involved webservers support HTTPS. [1,2]

Rical

[1] https://lists.gnu.org/archive/html/bug-standards/2017-10/msg00002.html
[2] https://lists.gnu.org/archive/html/bug-standards/2017-10/msg00005.html