Follow symlinks in test/mjsunit to allow linked test directories.

test/mjsunit/testcfg.py

Index: test/mjsunit/testcfg.py
diff --git a/test/mjsunit/testcfg.py b/test/mjsunit/testcfg.py
index cf4b6276e4ec159e66d40032819c0b51fd475915..4fbdcfca26626d7867e1d920a9832e382f5fe642 100644
--- a/test/mjsunit/testcfg.py
+++ b/test/mjsunit/testcfg.py
@@ -45,7 +45,7 @@ class MjsunitTestSuite(testsuite.TestSuite):
 
   def ListTests(self, context):
     tests = []
-    for dirname, dirs, files in os.walk(self.root):
+    for dirname, dirs, files in os.walk(self.root, followlinks=True):
       for dotted in [x for x in dirs if x.startswith('.')]:
         dirs.remove(dotted)
       dirs.sort()