Test scripts: Make build dir a variable

scripts/tests.sh

@@ -29,6 +29,7 @@
 set -e
 
 REPO_ROOT="$(dirname "$0")/.."
+SOLIDITY_BUILD_DIR="${SOLIDITY_BUILD_DIR:-build}"
 
 source "${REPO_ROOT}/scripts/common.sh"
 
@@ -120,7 +121,7 @@ do
         fi
 
         set +e
-        "$REPO_ROOT"/build/test/soltest --show-progress $log -- --testpath "$REPO_ROOT"/test "$optimize" --evm-version "$vm" $SMT_FLAGS $force_abiv2_flag
+        "$REPO_ROOT"/${SOLIDITY_BUILD_DIR}/test/soltest --show-progress $log -- --testpath "$REPO_ROOT"/test "$optimize" --evm-version "$vm" $SMT_FLAGS $force_abiv2_flag
 
         if test "0" -ne "$?"; then
             exit 1