Restore use of platform site package shim in iOS builds #2109
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#2101 removed the use of the platform site package shim, on the basis that pip's recently added support for iOS tags in
--platform
would remove the need for it. However, this overlooked the need for pip to honor platform tags in package specfiers (e.g.,toga; sys_platform == 'ios'
). This restores the use of the site package shim.PR Checklist: