test-symlink-os-yes-fs-no.py: clean up use of two-argument raise

This makes any attempt to port to Python 3 harder, and the new syntax
is supported in 2.4 already.

tests/test-symlink-os-yes-fs-no.py

@@ -24,7 +24,7 b' commands.status(u, repo)'
 # now disable symlink support -- this is what os.symlink would do on a
 # non-symlink file system
 def symlink_failure(src, dst):
-    raise OSError, (1, "Operation not permitted")
+    raise OSError(1, "Operation not permitted")
 os.symlink = symlink_failure
 
 # dereference links as if a Samba server has exported this to a