[Pidgin] #15316: configure: do not use exit status 0 in case of error

[Pidgin]

#15316: configure: do not use exit status 0 in case of error
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 Reporter:  mfiedler  |      Owner:  rekkanoryo
     Type:  patch     |     Status:  new
Milestone:            |  Component:  unclassified
  Version:            |   Keywords:
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 In configure.ac, there are two checks for invalid options where exit is
 called without status 1. In these cases, the error that occured cannot be
 detected by checking the exit status of configure. This patch fixes the
 issue.

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Ticket URL: <https://developer.pidgin.im/ticket/15316>
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