Never mind identifying loopback pipes

This would be nice to have, but it's a bit non-obvious to implement and
it's about time to merge to master.

Let's just do it at a later date if it turns out to be needed.

tests/px_ipc_map_test.py

@@ -228,17 +228,6 @@ def test_stdfds_ipc_and_network():
     assert ipc_map.fds[2] == '[PIPE] -> cupsd(1002) (->0x3922f6866312c495)'
 
 
-def test_stdfds_pipe_to_self():
-    files = [
-        # Set up stderr to pipe to another fd of our own process. Pipes are real-world OS X ones.
-        testutils.create_file("PIPE", "->0x3922f6866312c495", "0x3922f6866312cb55", 1234, fd=2),
-        testutils.create_file("PIPE", "->0x3922f6866312cb55", "0x3922f6866312c495", 1234, fd=7),
-    ]
-
-    ipc_map = testutils.create_ipc_map(1234, files)
-    assert ipc_map.fds[2] == '[PIPE] -> <myself, fd=7> (->0x3922f6866312c495)'
-
-
 def test_stdfds_pipe_to_unknown_not_root():
     files = [
         # Set up stderr as an unconnected pipe. The pipes is a real-world OS X one.