[Pidgin] #15678: Fix --enable-gnome-keyring and --enable-kwallet configure options

[Pidgin]

#15678: Fix --enable-gnome-keyring and --enable-kwallet configure options
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 Reporter:  mforney  |      Owner:  rekkanoryo
     Type:  patch    |     Status:  new
Milestone:           |  Component:  unclassified
  Version:           |   Keywords:
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 Currently, gnome-keyring support and kwallet support default to enabled,
 but if you specify --enable-gnome-keyring or --enable-kwallet, they are
 disabled.

 Also, configure was succeeding even if kwallet was enabled but not found
 and force_deps was set.

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Ticket URL: <https://developer.pidgin.im/ticket/15678>
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