Generally, we don't want any overriding xreflabels in the options
list, so that we can link to options and the link renders as the
option name. The -g option did this differently and config.sgml made
use of that for a link. The new --no-data-checksums option (commit 983a588e0b8) apparently copied this pattern, but that seems like the
wrong direction, as a future patch revealed.
To fix, remove the two xreflabels and rewrite the link in config.sgml
with an explicit link text.