bug: file INSTALL cannot find "C:/WINDOWS/System32/vcruntime140_1.dll" when using VS Build Tools

[valhallasw]

See flet-dev/flet#6436 for full details.

CMakeLists.txt pulls in

  "${SERIOUS_PYTHON_WINDIR}/System32/msvcp140.dll"
  "${SERIOUS_PYTHON_WINDIR}/System32/vcruntime140.dll"
  "${SERIOUS_PYTHON_WINDIR}/System32/vcruntime140_1.dll"

however those are 32-bit dlls (if they even exist) when using a 32-bit CMake. Instead, they should always pull the 64 bit version when using a 64 bit Python - or, alternatively, not require them at all, and depend on the user installing the VC runtime from the MS website.