Building agains dynamic libptread in Debian Stable

[Sam Hartman]

I do not believe that  you would need to link the KDC with threads
support in order to call mech_eap from one thread in a preauth plugin.
Similarly for kinit.

If you plan to use mech_eap or another GSS mechanism from multiple
threads at once, I strongly recommend that you arrange for libpthread to
be loaded before libgssapi_krb5 gets called.