Remove python bin declaration in switcher script

This removes non-hermetic python usage and instead follows the
recommendation of relying on the hermetic version of python packages
embedded in the Android source tree (which is already turned on via
python2 declaration in Android.bp).

Cherry pick of e1ceb9a9c58761fa5472c5deb3370234e2ea8997 from AOSP

Bug: 185904737
Test: m -j 8 ds-docs-switched, and verify that output before and after
matches

Change-Id: Ia831fbcff4c333aeaf7da6ca5a9af576f15079ac
Merged-In: Ia831fbcff4c333aeaf7da6ca5a9af576f15079ac
1 file changed
tree: b01c04b523e6a36bd765224d36e3d11e646229fa
  1. Android.bp
  2. switcher4.py