Debug Cirrus CI testing (#2414)

* Skip Cirrus CI iOS testing

* Remove support tick in readme

* Debugging cirrus windows failure

* Use a separate file to avoid error messages from vsdevcmd getting into the output

* cirrus: TEMP target just the test i care about

* Revert "cirrus: TEMP target just the test i care about"

This reverts commit 7ed4417970930ab9e0e1cb1f17497d406310d6ff.

* Remove debug code

* Fix windows issues with multiline -c Python commands

README.md

@@ -63,7 +63,7 @@ Usage
 | Travis CI       | ✅    |       | ✅      | ✅        |           |             |     |
 | CircleCI        | ✅    | ✅    |         | ✅        | ✅        |             | ✅³  |
 | Gitlab CI       | ✅    | ✅    | ✅      | ✅¹       | ✅        |             | ✅³  |
-| Cirrus CI       | ✅    | ✅    | ✅      | ✅        | ✅        |             | ✅³  |
+| Cirrus CI       | ✅    | ✅    | ✅      | ✅        | ✅        |             |      |
 
 <sup>¹ [Requires emulation](https://cibuildwheel.pypa.io/en/stable/faq/#emulation), distributed separately. Other services may also support Linux ARM through emulation or third-party build hosts, but these are not tested in our CI.</sup><br>
 <sup>² [Uses cross-compilation](https://cibuildwheel.pypa.io/en/stable/faq/#windows-arm64). It is not possible to test `arm64` on this CI platform.</sup><br>