Update pybind11Common.cmake

Author: henryiii

tools/pybind11Common.cmake

@@ -173,12 +173,13 @@ endif()
 # Check to see which Python mode we are in, new, old, or no python
 if(PYBIND11_NOPYTHON)
   set(_pybind11_nopython ON)
+# We won't use new FindPython if PYBIND11_FINDPYTHON is defined and falselike
+# Otherwise, we use if FindPythonLibs is missing or if FindPython was already used
 elseif(
-  NOT (DEFINED PYBIND11_FINDPYTHON AND NOT PYBIND11_FINDPYTHON)
+  (NOT DEFINED PYBIND11_FINDPYTHON OR PYBIND11_FINDPYTHON)
   AND (_pybind11_missing_old_python STREQUAL "NEW"
        OR PYBIND11_FINDPYTHON
        OR Python_FOUND
-       OR Python2_FOUND
        OR Python3_FOUND
       ))