login.c (dolastlog): BSD 4.4 systems don't have lastlog.h, but still

login.c (dolastlog): BSD 4.4 systems don't have lastlog.h, but still
	define struct lastlog somewhere.  Included from Dima Ruban's FreeBSD
	patches.

krlogin.c: Include sys/ioctl_compat.h if it is present (instead of
	just for 386BSD).

loginpaths.h (LPATH): If the OS provides _PATH_DEFPATH, use it to
	define LPATH and RPATH.

login.c: #include paths.h if present, and use it to set the pathnames
	for certain common files.

configure.in (withval): Check for <sys/ioctl_compat.h> and <paths.h>

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@10586 dc483132-0cff-0310-8789-dd5450dbe970