[tac_plus] PAM support for PAP

[Jeroen Nijhof]

Dear John,

Since I've noticed my old pam patch for pap is still used I've decided
to rewrite the patch.

Attached you can find the patch which will enable PAM support for PAP. I
used the 4.0.4.23 branch but it also works for 4.0.4.19 and 4.0.4.22.

Maybe it's worth to integrate the patch with the upstream code?

Thanks!

With kind regards,
Jeroen Nijhof
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