safe_mkdir(): uid/gid can now be -1 to mean "don't change it".
safe_mkdir(): uid/gid can now be -1 to mean "don't change it".

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