Update git submodules

* Update prebuilts/build-tools from branch 'master'
  to 1977a48004500e4ac1969eac749b27bbdbec2f37
  - Use py_runtime and python_top while waiting for rules_python.
    
    Test: b run //build/soong/cc/ndkstubgen uses py3cmd as sys.executable
    Change-Id: I56341d418b945a0891f18d09670e9a37b1b2ccb3
    
1 file changed