GN: add sanitize arg

third_party/freetype2/BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
 }
 
 import("../third_party.gni")
 
-if (is_android) {
+# TODO: build from source all the time?
+if (is_android || sanitize == "MSAN") {
   third_party("freetype2") {
     public_include_dirs = [ "../externals/freetype/include" ]
 
     deps = [
       "//third_party/libpng",
     ]
 
     include_dirs = [ "../freetype" ]
     defines = [
       "FT2_BUILD_LIBRARY",
@@ skipping 32 matching lines @@
   }
 } else {
   config("system_freetype2") {
     include_dirs = [ "/usr/include/freetype2" ]
     libs = [ "freetype" ]
   }
   group("freetype2") {
     public_configs = [ ":system_freetype2" ]
   }
 }