hmatrix-backprop-test: executable not found

Author: juhp

build-constraints.yaml

@@ -8093,6 +8093,7 @@ expected-test-failures:
     # executable or data files not found in our environment
     - AvlTree # 4.3: AvlTree-tests:  executable not found
     - lsfrom # "test: lsfrom does not exist (No such file or directory)" for 9.12.4 bootstrap
+    - hmatrix-backprop # hmatrix-backprop-test:  executable not found (9.12.4)
     - pandoc # missing files for 9.12.4 bootstrap
     - xlsx # 1.2.0: data-test:  executable not found for 9.12.4 bootstrap