The source code has been modified to use sysconf(_SC_CLK_TCK) instead
of CLK_TCK when _SC_CLK_TCK is known to be available or CLK_TCK is not
(needed for glibc 2.3.90+), and to use socklen_t where appropriate.
The source code has been corrected to not break C strict aliasing rules (this only affected auth_pam.c) and to insist on only one PAM message per call to the conversation function with Sun PAM (Solaris and HP-UX) because of differences in the parameter layout. The default limits have been bumped to values that are way too high for most systems, and comments suggesting that these defaults be decreased on particular installs have been added.
MD5_Final() has been corrected to actually zero the context
structure. This makes no difference for popa3d itself, but
may be important for possible other applications which might
use the popa3d MD5 routines.
