RFR: 8262366: Update glib to version 2.66.7

Fri Apr 2 22:30:14 UTC 2021

On Thu, 1 Apr 2021 23:47:15 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> All my testing looks good on all three platforms. I'll take a look at the diffs next.
>> 
>> One thing I did spot is that you need to update `gstreamer.md` and `glib.md` to bump the version numbers.
>
> It now builds for me on my old Linux box. And the changes to the /legal/ files looks good.
> 
> One more thing I just thought of: we should do a test build on macOS aarch64. I have no reason to believe that there will be a problem, but worth double-checking.

It builds fine on macOS aarch64 and I did minor testing as well. No issues.

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PR: https://git.openjdk.java.net/jfx/pull/447