git: openjdk/jdk16u: 8265531: doc/building.md should mention homebrew install freetype

[Christoph Langer]

Changeset: e4651f3a
Author:    George Adams <georgeadams1995 at gmail.com>
Committer: Christoph Langer <clanger at openjdk.org>
Date:      2021-04-29 20:29:23 +0000
URL:       https://git.openjdk.java.net/jdk16u/commit/e4651f3adc4543f61c114172985b59dc4b0b05d6

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

Backport-of: 5aab1609b97284ccff8b7ae20a3ddcf1e29c47d7

! doc/building.html
! doc/building.md