Prepend the tools directory to python module path

This works around possible collisions with modules installed in the system 
python directories. 

See Gentoo Linux bug report: 
http://bugs.gentoo.org/349794

Patch by Mike Gilbert <floppymaster@gmail.com>

Review URL: http://codereview.chromium.org/6253009


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6463 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

AUTHORS

@@ -34,3 +34,4 @@ Rodolph Perfetta <rodolph.perfetta@arm.com>
 Ryan Dahl <coldredlemur@gmail.com>
 Subrato K De <subratokde@codeaurora.org>
 Vlad Burlik <vladbph@gmail.com>
+Mike Gilbert <floppymaster@gmail.com>

SConstruct

@@ -32,7 +32,7 @@ import os
 from os.path import join, dirname, abspath
 from types import DictType, StringTypes
 root_dir = dirname(File('SConstruct').rfile().abspath)
-sys.path.append(join(root_dir, 'tools'))
+sys.path.insert(0, join(root_dir, 'tools'))
 import js2c, utils
 
 # ANDROID_TOP is the top of the Android checkout, fetched from the environment