Don't insist on pg_dumpall and psql being present in the old cluster,
since they are not needed. Do insist on pg_resetxlog being present
(in both old and new), since we need it. Also check for pg_config,
but only in the new cluster. Remove the useless attempt to call
pg_config in the old cluster; we don't need to know the old value of
--pkglibdir. (In the case of a stripped-down migration installation
there might be nothing there to look at anyway, so any future change
that might reintroduce that need would have to be considered carefully.)
Per my attempts to build a minimal previous-version installation to support
pg_upgrade.
In pg_upgrade, prevent psql AUTOCOMMIT=off by not loading .psqlrc.
In pg_upgrade, report /bin directory checks independent of /data checks.
Remove incorrect email address for pg_upgrade bug reports.
On Win32, pg_upgrade cannot sent any server log output to the log file
because of file access limitations on that platform.
