RFR: 8262366: Update glib to version 2.66.7

[Alexander Matveev]

- GLib was updated to version 2.66.7 and GStreamer to version 1.18.3
 - One bug was discovered in updated GStreamer which was causing deadlock or infinite loop during seek on macOS. See gstsystemclock.c for changes between ifdef GSTREAMER_LITE. Otherwise no changes.

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Commit messages:
 - 8262366: Update glib to version 2.66.7

Changes: https://git.openjdk.java.net/jfx/pull/447/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=447&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262366
  Stats: 39553 lines in 439 files changed: 23426 ins; 5427 del; 10700 mod
  Patch: https://git.openjdk.java.net/jfx/pull/447.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/447/head:pull/447

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