RFR: 6517125: FontStrike.getGlyphVectorOutline() not used

[Daniel Gredler]

This method is not used and can be deleted from the entire `FontStrike` class hierarchy. There was some discussion in 2007 about re-enabling if there were performance benefits, but 20 years have passed and no performance issues have emerged. In fact, the macOS OpenJDK never implemented this method.

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Commit messages:
 - Delete FontStrike.getGlyphVectorOutline(...)

Changes: https://git.openjdk.org/jdk/pull/28856/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28856&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6517125
  Stats: 98 lines in 8 files changed: 0 ins; 89 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/28856.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28856/head:pull/28856

PR: https://git.openjdk.org/jdk/pull/28856