RFR: 8273581: Change the mechanism by which JDK loads the platform-specific FontManager class [v6]

[Alexander Scherbatiy]

On Mon, 20 Sep 2021 17:56:25 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> Should `PlatformFontInfo` classes be marked `final`? They're not supposed to be subclassed.

The final keyword is added to the `PlatformFontInfo` clases.

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PR: https://git.openjdk.java.net/jdk/pull/5517