Handle posix_fallocate() failures correctly. Check also for AIX's "not supported" failure. Based on patch by Ralf Becker.
Handle posix_fallocate() failures correctly. Check also for AIX's "not supported" failure.
Based on patch by Ralf Becker.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot