FTP,HTTP → HTTPS in GNU Standards

[Paul Eggert]

In Gnulib, Emacs, etc. we are changing URLs to use https: instead of ftp: and 
http:, to discourage man-in-the-middle attacks when downloading software. The 
attached patch propagates these changes upstream to the GNU Coding Standards.

Although the GNU Coding Standards are not secret, plain HTTP is vulnerable to 
malicious routers that tamper with responses from GNU servers, and this sort of 
thing is all too common when people in some other countries browse US-based 
websites. See, for example:

Aceto G, Botta A, Pescapé A, Awan MF, Ahmad T, Qaisar S. Analyzing internet 
censorship in Pakistan. RTSI 2016. https://dx.doi.org/10.1109/RTSI.2016.7740626

HTTPS is not a complete solution here, but it can be a significant help.

gnustandards-https.diff
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