Fix run-tests.py when STDIN_FILE is used > 1 times (#711)

Each test should be run with its own directory of outputs, so the tests
can be run in parallel without clobbering results. Since I added wasm2c,
the spec `.wast` files were being used twice, but using the same output
directory. This would often work properly in a full run, but was flaky,
since they both write `.json` and `.wasm` files with the same names.

This fix gives them their own directories by always using the directory
name of the test.

0 files changed, 0 insertions, 0 deletions