[Piglit] Piglit fails to run OpenCL tests with --valgrind

Hi, I'm trying to run the OpenCL testsuite under valgrind, using piglit run --valgrind cl cl.results All tests are skipped, with "result": "skip", "command": "/usr/lib/x86_64-linux-gnu/piglit/bin/valgrind", "out": "An internal exception that should have b

[Piglit] [PATCH] Apply path correction to correct argument

This fixes running OpenCL tests under Valgrind, by applying the path transformation to the argument that the original command turned into. It would be nice to have a cleaner solution here that doesn't depend on text substitution, but as long as there is no OpenCL test named "valgrind", this should