Pass -S option to wrapper for python binary.

Prevent problem for some users using PAR file built by android's
build system which cause by the different site package of python
installed by user themselves.

Bug: 120469915
Test: 1. m atest
         atest --help
      2. apply aosp/861470
         full build

Change-Id: I72c83f9397f0e88eecfcd32806f1746520299447