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tests: fix test-patch.t on pickier /bin/sh implementations

Authored by durin42.

Description

tests: fix test-patch.t on pickier /bin/sh implementations

FreeBSD sh(1) doesn't accept -d, so we weren't testing what we
expected there. Let's just use a simple Python script instead.

Differential Revision: https://phab.mercurial-scm.org/D3620