[jdk13u-dev] RFR: 8293672: Update freetype md file

[Yuri Nesterenko]

clean backport of a license change following the update.

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Commit messages:
 - Backport fef345b19f74f5d706b173b1af87bcda98dc6ff2

Changes: https://git.openjdk.org/jdk13u-dev/pull/420/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk13u-dev&pr=420&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293672
  Stats: 95 lines in 1 file changed: 54 ins; 13 del; 28 mod
  Patch: https://git.openjdk.org/jdk13u-dev/pull/420.diff
  Fetch: git fetch https://git.openjdk.org/jdk13u-dev pull/420/head:pull/420

PR: https://git.openjdk.org/jdk13u-dev/pull/420