component/chromedriver: add missing libX11 in wrapper script

This was using system library.

     ldd ./parts/chromedriver-2.41/chromedriver
             linux-vdso.so.1 (0x00007ffc4b738000)
             libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f2aa9e46000)
             libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f2aa9e25000)
             librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f2aa9e1b000)
             libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f2aa9cfc000)
             libX11.so.6 => not found
             libnss3.so => not found
             libnssutil3.so => not found
             libnspr4.so => not found
             libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f2aa9b77000)
             libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f2aa9b5d000)
             libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f2aa999c000)
             /lib64/ld-linux-x86-64.so.2 (0x00007f2aa9e53000)
             libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f2aa9928000)

component/chromedriver/buildout.cfg

@@ -7,6 +7,7 @@ extends =
   ../chromium/buildout.cfg
   ../nss/buildout.cfg
   ../nspr/buildout.cfg
+  ../xorg/buildout.cfg
 
 parts =
   chromedriver-wrapper
@@ -65,6 +66,7 @@ x86-64 = https://chromedriver.storage.googleapis.com/${:version}/chromedriver_li
 library =
   ${nss:location}/lib
   ${nspr:location}/lib
+  ${libX11:location}/lib
 path =
 install =
   import os, shutil