Use our own freetype2 (from //third_party) on Linux and FNL.

Possibly we should do the same for Android (instead of "our own copy",
from //third_party/freetype-android), to be investigated separately.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/1528173003 .
diff --git a/skia/BUILD.gn b/skia/BUILD.gn
index ebc3f09..65f1dbd 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -442,8 +442,10 @@
   ]
 
   if (is_linux) {
-    configs += [ "//build/config/linux:freetype2" ]
-    deps += [ "//third_party/icu:icuuc" ]
+    deps += [
+      "//third_party/freetype2",
+      "//third_party/icu:icuuc",
+    ]
   }
 
   if (is_android) {