[Pidgin] #15590: tag.sh path incorrect if $(MAKE) -C build is used

[Pidgin]

#15590: tag.sh path incorrect if $(MAKE) -C build is used
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 Reporter:  tusker  |       Owner:
     Type:  defect  |      Status:  new
Milestone:  3.0.0   |   Component:  libpurple
  Version:          |  Resolution:
 Keywords:          |
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Comment (by QuLogic):

 I don't think this is correct since $(top_srcdir) is for a different
 directory than the one that is being used, but I have applied a fix that
 should work.

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Ticket URL: <https://developer.pidgin.im/ticket/15590#comment:2>
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