Unable to disable cross_check_fips in RPM

[cbgbt]

Image I'm using:
v0.42.0

Issue or Feature Request:
I'm building an RPM that I would like to avoid running the check-fips script. We expose a macro cross_check_fips which should be able to control it, but it seems that redefining the macro to 0 or using %undefine doesn't result in the desired behavior. It's possibly something to do with this conditional.

I'm working around this issue for now with a macro like this:

%global __cross_check_fips_cmd true