Update barracuda in the hopes that our burst crashes go away. (#4359)

* Update barracuda in the hopes that our burst crashes go away.

* Check for an executable with the same name as the env before failing.

* ignore macblas.

com.unity.ml-agents/package.json

   "unity": "2018.4",
   "description": "Use state-of-the-art machine learning to create intelligent character behaviors in any Unity environment (games, robotics, film, etc.).",
   "dependencies": {
-    "com.unity.barracuda": "1.0.1"
+    "com.unity.barracuda": "1.0.2"
   }
 }

ml-agents/tests/yamato/yamato_utils.py

     Try to find the player executable. This seems to vary between Unity versions.
     """
     ignored_extension = frozenset([".dll", ".dylib", ".bundle"])
+    ignored_files = frozenset(["macblas"])
-            if ext in ignored_extension:
+            if ext in ignored_extension or filename in ignored_files:
                 continue
             file_path = os.path.join(root, filename)
             if os.access(file_path, os.X_OK):