Subzero: Move python scripts into a common pydir.

pydir/crosstest.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import re
 import subprocess
 import sys
 import tempfile
 
-sys.path.insert(0, '../pydir')
 from utils import shellcmd
 from utils import FindBaseNaCl
 
 if __name__ == '__main__':
     """Builds a cross-test binary that allows functions translated by
     Subzero and llc to be compared.
 
     Each --test argument is compiled once by llc and once by Subzero.
     C/C++ tests are first compiled down to PNaCl bitcode by the
     build-pnacl-ir.py script.  The --prefix argument ensures that
@@ skipping 110 matching lines @@
                       '-o=' + obj_llc,
                       bitcode])
             objs.append(obj_llc)
         else:
             objs.append(bitcode)
 
     linker = 'clang' if os.path.splitext(args.driver)[1] == '.c' else 'clang++'
     shellcmd([linker, '-g', '-m32', args.driver] +
              objs +
              ['-lm', '-lpthread', '-o', os.path.join(args.dir, args.output)])