FindPythonInterp: support single-user installs on Windows
CMake currently searches in HKEY_LOCAL_MACHINE. According to PEP 514, single-user installs are registered in HKEY_CURRENT_USER. See also FindPythonLibs.cmake which also searches both in HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER.
Topic-rename: FindPythonInterp-windows-current-user
Edited by Brad King