[Pidgin] #15860: Add purple_strcasestr_len() to libpurple/util.h

[Pidgin]

#15860: Add purple_strcasestr_len() to libpurple/util.h
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 Reporter:  MarkDoliner  |      Owner:
     Type:  task         |     Status:  new
Milestone:  3.0.0        |  Component:  libpurple
  Version:               |   Keywords:
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 This function will be added to the private 2.x.y repo when we release
 2.10.8. We should make it public in 3.0.0.

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Ticket URL: <https://developer.pidgin.im/ticket/15860>
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