Merge bitcoin/bitcoin#28891: test: fix AddNode unit test failure on OpenBSD

007d6f0 test: fix `AddNode` unit test failure on OpenBSD (Sebastian Falbesoner)

Pull request description:

  On OpenBSD 7.4, the following check of the unit test `test_addnode_getaddednodeinfo_and_connection_detection` currently fails:
  ```
  BOOST_CHECK(!connman->AddNode({/*m_added_node=*/"127.1", /*m_use_v2transport=*/true}));
  ```
  The reason for that is that this OS seemingly doesn't support the IPv4 shorthand notation with omitted zero-bytes:

  ```
  $ ping 127.1
  ping: no address associated with name
  ```

  As a simple fix, this PR skips the check for this with a pre-processor #if. On NetBSD and FreeBSD, `127.1` is resolved correctly to localhost and hence the test passes (thanks to vasild for verifying on the latter!).

ACKs for top commit:
  vasild:
    ACK 007d6f0

Tree-SHA512: 8ab8393c490e1ecc140e8ff74f6fa4d26d0dd77e6a77a241cd198314b8c5afee7422f95351ca05f4c1742433dab77016a8ccb8d28062f8edd4b703a918a2bbda

Author: fanquake

src/test/net_peer_connection_tests.cpp

@@ -116,7 +116,10 @@ BOOST_AUTO_TEST_CASE(test_addnode_getaddednodeinfo_and_connection_detection)
 
     BOOST_TEST_MESSAGE("\nCall AddNode() with 2 addrs resolving to existing localhost addnode entry; neither should be added");
     BOOST_CHECK(!connman->AddNode({/*m_added_node=*/"127.0.0.1", /*m_use_v2transport=*/true}));
+    // OpenBSD doesn't support the IPv4 shorthand notation with omitted zero-bytes.
+#if !defined(__OpenBSD__)
     BOOST_CHECK(!connman->AddNode({/*m_added_node=*/"127.1", /*m_use_v2transport=*/true}));
+#endif
 
     BOOST_TEST_MESSAGE("\nExpect GetAddedNodeInfo to return expected number of peers with `include_connected` true/false");
     BOOST_CHECK_EQUAL(connman->GetAddedNodeInfo(/*include_connected=*/true).size(), nodes.size());