Revert "Work-around Z3 bug"

This reverts commit b54ec34

I figured out a work-around in CN.

check.sh

@@ -14,20 +14,7 @@ good=0
 bad=0
 declare -a bad_tests
 
-# https://github.com/rems-project/cerberus/pull/494 exposed an issue in
-# the Z3 which is a bit difficult to work around in the implementation
-# itself and so we have this hacky work-around instead whilst it is fixed
-# upstream https://github.com/Z3Prover/z3/issues/7352
-if [[ "${CN}" == "cn verify" ]] \
- || [[ "${CN}" == *"--solver-type=z3"* ]]; then
- FILES=($(find "${SCRIPT_DIR}/src/examples" -name '*.c' \
- ! -name queue_pop.c \
- ! -name queue_push_induction.c))
-else
- FILES=($(find "${SCRIPT_DIR}/src/examples" -name '*.c'))
-fi
-
-for file in "${FILES[@]}"
+for file in $SCRIPT_DIR/src/examples/*c;
 do
  echo "Checking $file ..."
  $CN $file