Update from https://crrev.com/320931

build/config/linux/pkg-config.py

Index: build/config/linux/pkg-config.py
diff --git a/build/config/linux/pkg-config.py b/build/config/linux/pkg-config.py
index a4f4703bd3814ed971845042c5eda0e8917f5913..fadcc0bbcf9dfbabd92e24475ecd2d7ed91b3ebd 100644
--- a/build/config/linux/pkg-config.py
+++ b/build/config/linux/pkg-config.py
@@ -112,6 +112,7 @@ parser.add_option('-s', action='store', dest='sysroot', type='string')
 parser.add_option('-a', action='store', dest='arch', type='string')
 parser.add_option('--atleast-version', action='store',
                   dest='atleast_version', type='string')
+parser.add_option('--libdir', action='store_true', dest='libdir')
 (options, args) = parser.parse_args()
 
 # Make a list of regular expressions to strip out.
@@ -138,6 +139,18 @@ if options.atleast_version:
     print "false"
   sys.exit(0)
 
+if options.libdir:
+  try:
+    libdir = subprocess.check_output([options.pkg_config,
+                                      "--variable=libdir"] +
+                                     args,
+                                     env=os.environ)
+  except:
+    print "Error from pkg-config."
+    sys.exit(1)
+  sys.stdout.write(libdir.strip())
+  sys.exit(0)
+
 try:
   flag_string = subprocess.check_output(
       [ options.pkg_config, "--cflags", "--libs-only-l", "--libs-only-L" ] +