msan: build expat from source

gyp/expat.gyp

+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Build expat from source.
+# Used on Linux bots for testing the Android FontMgr xml parsing.
+# This is mostly important for the MSAN bot's instrumentation.
+
+{
+    'targets': [{
+        'target_name': 'expat',
+        'type': 'static_library',
+        'cflags': [ '-w' ],
+        'defines': [ 'HAVE_MEMMOVE' ],
+        'sources': [
+            '../third_party/externals/expat/lib/xmlparse.c',
+            '../third_party/externals/expat/lib/xmlrole.c',
+            '../third_party/externals/expat/lib/xmltok.c',
+        ],
+        'direct_dependent_settings': {
+            'include_dirs': [ '../third_party/externals/expat/lib' ],
+        },
+    }]
+}