Add build target 'freetype2'

Change-Id: Ia64334141920eb7ad4ad8c9b3a14fb4a313316cd
diff --git a/BUILD.gn b/BUILD.gn
index 8b72fea..8e1f93e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -4,7 +4,14 @@
   ]
 }
 
-source_set("freetype") {
+#TODO(mikejurka): Remove once we've migrated to the freetype2 target everywhere
+group("freetype") {
+  public_deps = [
+    ":freetype2",
+  ]
+}
+
+source_set("freetype2") {
   sources = [
     # The following files are not sorted alphabetically, but in the
     # same order as in Android.mk to ease maintenance.