libctf and libsframe testing

[Jan Beulich]

Hello,

just came to notice that the testsuite runs are all building binaries for the
host, not the target. While this may be sensible when testing an individual
target, (afaict) it's doing all the same over and over when doing bulk tests.
I couldn't spot any means (e.g. an env var) to override this behavior, i.e.
optionally suppress such redundant testing. If there is one, could you please
point me in the right direction? If there is none, can something be added?
(What I would not want to end up with is a whitelist of check-* options to
pass to make; it's then too easy to miss one, if not now, then when something
new is added.)

Thanks, Jan