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This is more flexible and doesn't couple electric quoting to font
locking.
Give that 'electric-quote-code-faces' was just introduced, remove it
without formal deprecation.

* lisp/electric.el (electric-quote-inhibit-functions): New abnormal
hook variable.
(electric-quote-post-self-insert-function): Run the hook.  Remove
use of old 'electric-quote-code-faces' variable.

* test/lisp/electric-tests.el (electric-quote-markdown-in-text)
(electric-quote-markdown-in-code): Adapt unit tests.