RFR: 8368572: Update WebKit to 623.1

[Hima Bindu Meda]

This PR updates Webkit to v623.1. Verified build and sanity on Mac, Linux and Windows platforms. No issue seen.

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Commit messages:
 - change file permissions
 - whitespace correction
 - Update webkit to v623.1

Changes: https://git.openjdk.org/jfx/pull/2042/files
  Webrev: Webrev is not available because diff is too large
  Issue: https://bugs.openjdk.org/browse/JDK-8368572
  Stats: 505661 lines in 8991 files changed: 253929 ins; 188948 del; 62784 mod
  Patch: https://git.openjdk.org/jfx/pull/2042.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2042/head:pull/2042

PR: https://git.openjdk.org/jfx/pull/2042