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

007d6f0e85bc329040bb405ef6016339518caa66 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 007d6f0e85bc329040bb405ef6016339518caa66

Tree-SHA512: 8ab8393c490e1ecc140e8ff74f6fa4d26d0dd77e6a77a241cd198314b8c5afee7422f95351ca05f4c1742433dab77016a8ccb8d28062f8edd4b703a918a2bbda

0 files changed, 0 insertions, 0 deletions