RFR: 8265531: doc/building.md should mention homebrew install freetype

[Erik Joelsson]

On Tue, 20 Apr 2021 14:58:02 GMT, George Adams <github.com+20224954+gdams at openjdk.org> wrote:

> Updates the docs/building.html guide to include steps to install FreeType on macOS using homebrew.

Sure, you need to initiate with the integrate command though.

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PR: https://git.openjdk.java.net/jdk/pull/3590