[tox] remove unneeded print statements

This information is already displayed by pytest in the header of the test run output

tox.ini

@@ -13,9 +13,6 @@ deps =
 install_command =
     {envpython} -m pip install -v {opts} {packages}
 commands =
-    # check that we have the expected Python version and architecture
-    {envpython} -c "import sys; print(sys.version)"
-    {envpython} -c "import struct; print(struct.calcsize('P') * 8)"
     # run the test suite against the package installed inside tox env
     py.test {posargs:--pyargs fontTools}