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Change linking of CGDisplayCreateUUIDFromDisplayID on macos (#1626)

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* Link CGDisplayCreateUUIDFromDisplayID through ColorSync instead of CoreGraphics

* Conditionally link through ColorSync only if WINIT_LINK_COLORSYNC is set
to true

* Document new macos env var in README
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Imberflur 2021-02-05 02:58:55 -05:00 • committed by GitHub
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@ -110,3 +110,13 @@ fn main() {
```
And run the application with `cargo apk run --example request_redraw_threaded`
#### MacOS
To ensure compatibility with older MacOS systems, winit links to
CGDisplayCreateUUIDFromDisplayID through the CoreGraphics framework.
However, under certain setups this function is only available to be linked
through the newer ColorSync framework. So, winit provides the
`WINIT_LINK_COLORSYNC` environment variable which can be set to `1` or `true`
while compiling to enable linking via ColorSync.