[Bug 283273] bin/csh: tc.const.h depends on host, not target, headers

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283273

--- Comment #4 from Ed Maste <emaste@freebsd.org> ---
I'm not sure exactly what's happening here.  If I delete all tc.const.h (find
<objdir> -name tc.const.h -print -delete) followed by `make buildworld`
tc.const.h is not generated correctly (for either bin/csh or rescue/rescue).

But I think we should be getting the right path via --sysroot in CC. In the
buildenv environment I do see

CC=cc -target x86_64-unknown-freebsd15.0 --sysroot=/usr/obj/.../amd64.amd64/tmp
-B/usr/obj/.../amd64.amd64/tmp/usr/bin

I tried deleting all tc.const.h  and then running `make buildenv` followed by
`make -C bin/csh` and tc.const.h is indeed generated correctly.

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