resolve LC_DYSYMTAB warning in unit test

[dongjiang1989]

What does it do ?

Motivation

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• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

Fix ld warning in macos

$ make test
...
# sigs.k8s.io/external-dns/provider/ns1.test
ld: warning: '/private/var/folders/wb/t6q4mr6d5bj96h5clzfc6xzc0000gn/T/go-link-2160407824/000013.o' has malformed LC_DYSYMTAB, expected 98 undefined symbols to start at index 1626, found 95 undefined symbols starting at index 1626
ok  	sigs.k8s.io/external-dns/provider/linode	1.630s
# sigs.k8s.io/external-dns/provider/oci.test
ld: warning: '/private/var/folders/wb/t6q4mr6d5bj96h5clzfc6xzc0000gn/T/go-link-2561427685/000013.o' has malformed LC_DYSYMTAB, expected 98 undefined symbols to start at index 1626, found 95 undefined symbols starting at index 1626
...

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[k8s-ci-robot]

@dongjiang1989: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-external-dns-unit-test	33b447e	link	true	/test pull-external-dns-unit-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[coveralls]

Pull Request Test Coverage Report for Build 21750946153

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.005%) to 79.153%

---

Files with Coverage Reduction	New Missed Lines	%
openshift_route.go	1	83.97%

Totals
Change from base Build 21559764040:	-0.005%
Covered Lines:	16038
Relevant Lines:	20262

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💛 - Coveralls