[Pidgin] #16459: Backport Windows FHS support from 3.x

[Pidgin]

#16459: Backport Windows FHS support from 3.x
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 Reporter:  renatosilva  |       Owner:  datallah
     Type:  enhancement  |      Status:  new
Milestone:               |   Component:  winpidgin (gtk)
  Version:  2.10.10      |  Resolution:
 Keywords:               |
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Comment (by EionRobb):

 renatosilva pointed out on IRC that it's not switched from pidgin.dll to
 libpurple.dll but to libpidgin.dll, which would break any plugins that
 were linking against pidgin.dll

 So, so far, the patch needs to be changed to not change DATADIR and the
 pidgin.dll output.  Are there any other backwards-incompatible changes
 lurking in there?

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Ticket URL: <https://developer.pidgin.im/ticket/16459#comment:10>
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