Review Request: Add option to control PAM support

[Michael Palimaka]

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http://git.reviewboard.kde.org/r/103818/
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Review request for KDE Base Apps.


Description
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kcheckpass and KDM support being built without PAM, but this selection is currently automagic.

This patch adds a WITH_PAM option, and makes sure that the patched cmake modules are preferred over the system ones.


Diffs
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  ConfigureChecks.cmake fe06d9e 
  cmake/modules/FindPAM.cmake 3499836 
  cmake/modules/UnixAuth.cmake 904f0cb 

Diff: http://git.reviewboard.kde.org/r/103818/diff/diff


Testing
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For me, both kcheckpass and KDM link against libcrypt instead of PAM and work fine when -DWITH_PAM=no is specified.


Thanks,

Michael Palimaka

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