SETXXENT_RET, and SETXXENT_TEST. They were used by the now
removed pwent.c and grent.c.
* Remove the definition of PASSWD_PAG_FILE,
GROUP_PAG_FILE, SHADOW_PAG_FILE, and SGROUP_PAG_FILE. They are
never used.
* Don't include "snprintf.h". The file does not
exist in shadow.
* Add new macro unused to tag unused parameters.