sql.el MariaDB support

[Robert Cochran <robert-emacs@cochranmail.com>]

Hello emacs-devel,

I've decided that I want to spend a little bit of time improving the
MariaDB support in sql.el to make a nicer experience, namely changing
the prompt regexps so that the prompts will actually show up without
having to fiddle with sql-prompt-regexp.

What I'm not so sure about, and thus asking here, is whether or not to
put the MariaDB changes in with the MySQL product? MariaDB is still a
drop-in replacement for MySQL AFAIK, so in my mind it wouldn't be
unreasonable to lump those two together as a single product. But I'm not
well-versed on what doing that may imply.

TBH, I'd rather lump them together, as really all I'm intending to do is
modify the continuation prompt regexps to work for either database, and
making a whole separate MariaDB product would be overkill in my mind.

Thoughts?

-- 
~Robert Cochran

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