Update the gyp Linux build:

build/linux/pkg_config_wrapper.py

+#!/bin/env python
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+__doc__ = """
+Wrapper script for executing pkg-config with the arguments supplied
+on the command line and suppressing the exit status and error output
+when the error is simply that the specified package isn't installed.
+"""
+
+import sys
+import subprocess
+
+p = subprocess.Popen(['pkg-config'] + sys.argv[1:],
+                     stderr=subprocess.PIPE)
+(stdout, stderr) = p.communicate()
+
+exit_status = p.wait()
+
+if exit_status == 1:
+    import re
+    if re.search('No package.*found', stderr):
+        # Exit status of 1 with a presumably "normal" not found message.
+        # Just swallow the "error."
+        sys.exit(0)
+
+sys.stderr.write(stderr)
+
+sys.exit(exit_status)