Remove essentials from yml files

appveyor.yml

@@ -46,10 +46,6 @@ install:
   - cd ..
   - git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
   - cd boost-root
-  - git submodule update --init tools/build
-  - git submodule update --init tools/boost_install
-  - git submodule update --init libs/config
-  - git submodule update --init libs/headers
   - git submodule update --init tools/boostdep
   - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\function\
   - python tools/boostdep/depinst/depinst.py function