OpenBSD not MULTIARCH

[065cf450-4a32-4ca8-a482-647cb8a0bd12]

BPO	46446
Nosy	@kmosiejczuk
PRs	python/cpython#30721

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = None closed_at = None created_at = labels = ['build', '3.9', '3.10'] title = 'OpenBSD not MULTIARCH' updated_at = user = 'https://github.com/kmosiejczuk' ``` bugs.python.org fields: ```python activity = actor = 'kmosiejczuk' assignee = 'none' closed = False closed_date = None closer = None components = ['Build'] creation = creator = 'kmosiejczuk' dependencies = [] files = [] hgrepos = [] issue_num = 46446 keywords = ['patch'] message_count = 1.0 messages = ['411032'] nosy_count = 1.0 nosy_names = ['kmosiejczuk'] pr_nums = ['30721'] priority = 'normal' resolution = None stage = 'patch review' status = 'open' superseder = None type = 'compile error' url = 'https://bugs.python.org/issue46446' versions = ['Python 3.9', 'Python 3.10'] ```

[065cf450-4a32-4ca8-a482-647cb8a0bd12]

Just like FreeBSD, MULTIARCH should not be passed to OpenBSD.

Just add another line like done for FreeBSD