Our use of
ltl2tgba=ltl2tgba
autfilt=autfilt
...
all over the test cases comes from the time where those tools were not
in PATH and we actually had something like
ltl2tgba=../../bin/ltl2tgba
autfilt=../../bin/autfilt
But today that is useless, and we prefer to write ltl2tgba rather than
$ltl2tgba, so let's remove this old cruft.
* tests/core/basimul.test, tests/core/det.test, tests/core/lbt.test,
tests/core/lenient.test, tests/core/ltl2dstar.test,
tests/core/ltl2dstar2.test, tests/core/ltl2dstar3.test,
tests/core/ltl2dstar4.test, tests/core/ltlcross2.test,
tests/core/ltlcross3.test, tests/core/ltlcross4.test,
tests/core/ltlcrossce2.test, tests/core/ltldo.test,
tests/core/ltlfilt.test, tests/core/optba.test,
tests/core/prodor.test, tests/core/rand.test,
tests/core/randomize.test, tests/core/remfin.test,
tests/core/satmin.test, tests/core/sbacc.test,
tests/core/strength.test, tests/core/stutter-ltl.test,
tests/core/stutter-tgba.test, tests/core/unabbrevwm.test,
tests/core/unambig.test: Get rid of all tool=tool assignments.
