Add a new driver bug workaround SANDBOX_START_EARLY

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 d63b2d65b91e9fe2c5641ea74c1eec11285a2456..675ce1ab7d5c4495f7ddfed34e55269c2aaeed83 100755
--- a/build/config/linux/pkg-config.py
+++ b/build/config/linux/pkg-config.py
@@ -123,6 +123,7 @@ def main():
   parser.add_option('--atleast-version', action='store',
                     dest='atleast_version', type='string')
   parser.add_option('--libdir', action='store_true', dest='libdir')
+  parser.add_option('--dridriverdir', action='store_true', dest='dridriverdir')
   (options, args) = parser.parse_args()
 
   # Make a list of regular expressions to strip out.
@@ -162,6 +163,18 @@ def main():
     sys.stdout.write(libdir.strip())
     return 0
 
+  if options.dridriverdir:
+    cmd = [options.pkg_config, "--variable=dridriverdir"] + args
+    if options.debug:
+      sys.stderr.write('Running: %s\n' % cmd)
+    try:
+      dridriverdir = subprocess.check_output(cmd)
+    except:
+      print "Error from pkg-config."
+      return 1
+    sys.stdout.write(dridriverdir.strip())
+    return 0
+
   cmd = [options.pkg_config, "--cflags", "--libs"] + args
   if options.debug:
     sys.stderr.write('Running: %s\n' % ' '.join(cmd))