tests: more uses of $(...) over `...` for command substitution Somehow missed by the previous changes. No big deal, fix them now. * t/ax/depcomp.sh: Here. * t/autodist.sh: And here. * t/autodist-no-duplicate.sh: And here. * t/autodist-subdir.sh: Ad here. * t/remake11.sh t/self-check-me.tap: And here. * t/perf/testsuite-summary.sh: And here. * t/perf/testsuite-recheck.sh: And here. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>