Log Message:
pkgsrc added --without-libcrack to CONFIGURE_ARGS if libcrack is missing
from PKG_OPTIONS, and also comments out the libcrack module in the PLIST.
However this means nothing to the PAM configure script, which will find a
system libcrack and install the libcrack module.  When the pkgsrc bulk
build deinstalls PAM, it detects the leftover libcrack module and marks
PAM and its dependents failed.

Fix this by adding a --disable-crack option to the configure script.