login: re-add lastlog.h header

This include was removed in a365953a but we will need it again
when we move from utmp.h to utmpx.h.

On Linux (glibc, musl) the struct lastlog is defined in utmp.h
and lastlog.h just includes utmp.h.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

Conflicts:
	login-utils/login.c

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
2 files changed