Re: spelling fix: cloneable -> clonable

[Bruno Haible]

Paul Eggert wrote:
> See, for example:
> 
> https://thecontentauthority.com/blog/clonable-vs-cloneable

Wow, that's a long writeup!

> which says both "Cloneable is a misspelling of the word clonable, which 
> refers to an object that can be cloned or copied in its entirety." and 
> "'Cloneable,' on the other hand, is the correct spelling and is widely 
> accepted in both British and American English." (!)

I directly jumped to the summary table which specifically talks about
software development, as opposed to e.g. biotechnology.

> In this particular context the word doesn't add enough useful info to be 
> worth the spelling discordance, so I removed it by installing the attached.

Hmm, this is not good either.

The gnulib repository has 4 URLs, namely
  https://git.savannah.gnu.org/gitweb/?p=gnulib.git  -- 'git clone' fails
  https://git.savannah.gnu.org/cgit/gnulib.git/      -- 'git clone' fails
  https://git.savannah.gnu.org/git/gnulib.git        -- 'git clone' ok
  ssh://USER@git.savannah.gnu.org/srv/git/gnulib     -- 'git clone' ok

For the purposes of 'bootstrap', which uses git commands, only the last two
work. How do we discourage / prevent the user from setting GNULIB_URL to
one among the first two? If you don't want to see the word "cloneable",
we need another way.

The fourth one works only for a small set of people. Therefore we can
give the third one as example; incidentally, it's also the default.
Done through the patch below.

Bruno

0001-bootstrap-Try-to-prevent-the-user-from-setting-GNULI.patch
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