[jfx11u] RFR: 8262366: Update glib to version 2.66.7

[Kevin Rushforth]

Backport glib / gstreamer update from jfx mainline to jfx11u. The backport applied cleanly, and I ran a sanity test on Windows (I'll test on other two platforms before integrating).

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Commit messages:
 - 8262366: Update glib to version 2.66.7

Changes: https://git.openjdk.java.net/jfx11u/pull/2/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=2&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262366
  Stats: 39567 lines in 441 files changed: 23434 ins; 5427 del; 10706 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/2.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/2/head:pull/2

PR: https://git.openjdk.java.net/jfx11u/pull/2