(char-ideographic-strokes-from-domains): New function.

(char-ideographic-strokes-from-domains): New function.
(char-ideographic-strokes): Add new optional argument
`preferred-domains'; use `char-ideographic-strokes-from-domains'.
(char-daikanwa-strokes): Specify '(daikanwa) as the
`preferred-domains' for `char-ideographic-strokes'.