[jdk15u-dev] RFR: 8262392: Update Mesa 3-D Headers to version 21.0.3

[Andrew Brygin]

This is a clean backport of JDK-8262392 into 13u in order to keep Mesa 3-D Headers in sync with upstream and 11u.

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Commit messages:
 - Backport 138d573c3567e9a51b1ac2b1de89b41c4b51ae93

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/103/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=103&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262392
  Stats: 144 lines in 6 files changed: 100 ins; 21 del; 23 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/103.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/103/head:pull/103

PR: https://git.openjdk.java.net/jdk15u-dev/pull/103