Remove unused libraries and updates from pypi.org
--- a/cmake/virtualenv.cmake
+++ b/cmake/virtualenv.cmake
@@ -24,10 +24,6 @@ endfunction()
 
 function(virtualenv_install)
     virtualenv_create()
-    execute_process(
-      COMMAND ${VIRTUALENV_BIN_DIR}/${VIRTUALENV_PYTHON_EXENAME} -m pip install --upgrade pip
-      COMMAND ${VIRTUALENV_BIN_DIR}/${VIRTUALENV_PYTHON_EXENAME} -m pip install --upgrade setuptools
-    )
     message("${VIRTUALENV_BIN_DIR}/${VIRTUALENV_PYTHON_EXENAME} -m pip install ${ARGN}")
     execute_process(
       RESULT_VARIABLE rc
--- a/tensilelite/requirements.txt
+++ b/tensilelite/requirements.txt
@@ -3,6 +3,3 @@ pyyaml
 msgpack
 joblib>=1.4.0; python_version >= '3.8'
 joblib>=1.1.1; python_version < '3.8'
-simplejson
-ujson
-orjson