macos: Fix broken binaries on macos < 11.0

Remove duplicate orc-tool.recipe

orc.recipe does the same thing, and we can just use that instead of
duplicating the recipe.

macos: Fix broken binaries on macos < 11.0

orc was unconditionally using a symbol that is only available on macOS
11.0 and newer.

Fixes #408 (closed)

See also orc!87 (merged)