Delete references to --with-system-db from README.

	* build.texinfo (HPUX): Fix typo.
	(Options to Configure): Note that --with-system-db is unsupported,
	concerning possible lossage with loading dumpfiles.


To generate a diff of this commit:



	cvs diff -r1.30 -r1.31 krb5/README
	cvs diff -r1.84 -r1.85 krb5/doc/ChangeLog
	cvs diff -r1.17 -r1.18 krb5/doc/build.texinfo