[jdk17u-dev] RFR: 8306881: Update FreeType to 2.13.0

[Martin Doerr]

Clean backport of [JDK-8306881](https://bugs.openjdk.org/browse/JDK-8306881) plus workaround for build warning with Xcode 11.3 (2nd commit).

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Commit messages:
 - Suppress clang warning missing-declarations as needed for Xcode 11.3
 - Backport 723582c524c62ee73f7984a53b046f8832b23a7f

Changes: https://git.openjdk.org/jdk17u-dev/pull/1504/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1504&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306881
  Stats: 3607 lines in 284 files changed: 1611 ins; 690 del; 1306 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1504.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1504/head:pull/1504

PR: https://git.openjdk.org/jdk17u-dev/pull/1504