Control FreeType linkage globally in //build/config/freetype

Preparation for linking FreeType on Windows.

BUG=700926

Review-Url: https://codereview.chromium.org/2773123002
Cr-Original-Commit-Position: refs/heads/master@{#459471}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 53207ce64fc1d03d0fce3f8596a4a3ba1f917543
1 file changed