Ignore res_init test on macOS

[JohnTitor]

This addresses the below failure:

 = note: Undefined symbols for architecture x86_64:
            "_res_9_init", referenced from:
                main::fn_res_init::h8e336279ac8061c4 in main-00bd2ff8180a104c.3yxb2bpe56zwhp2u.rcgu.o
                ___test_fn_res_init in libmain.a(main.o)
          ld: symbol(s) not found for architecture x86_64
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

Signed-off-by: Yuki Okushi jtitor@2k36.org

[rust-highfive]

@JohnTitor: no appropriate reviewer found, use r? to override

[JohnTitor]

@bors r+

[bors]

📌 Commit 8081c99 has been approved by JohnTitor

It is now in the queue for this repository.

[bors]

⌛ Testing commit 8081c99 with merge 3ee203b...

[bors]

☀️ Test successful - checks-actions, checks-cirrus-freebsd-12, checks-cirrus-freebsd-13, checks-cirrus-freebsd-14
Approved by: JohnTitor
Pushing 3ee203b to master...