Move my simple logging API to a separate library. It is now already used
by hastctl(8), hastd(8) and auditdistd(8) and will soon be also used
by casperd(8) and its services. There is no documentation and pjdlog.h
header file is not installed in /usr/include/ to keep it private.
Unfortunately we don't have /lib/private/ at this point, only
/usr/lib/private/, so the library is installed in /lib/.

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