Silence byte compiler.
Added own implementation of flymake init and temp names.

Implemented our own versions of `flymake-create-temp-inplace` and
`flymake-create-temp-intemp`.

We need them to ensure better temporary file names to comply well with
Drupal Coder Sniffer.

We need the new `drupal/flymake-phpcs-init` to call our own temporary
file name functions.

Simplified setting `flymake-allowed-file-name-masks`.