Windows: Handle cases, where filenames are on other volumnes.
Windows: Handle cases, where filenames are on other volumnes.

* The relative name for these cases is defined to be the absolute
  path then.

* This should enable to compile on volumes other than where Python
  is installed.

tempbottle/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,tempbottle/Nuitka,wfxiang08/Nuitka,tempbottle/Nuitka,wfxiang08/Nuitka,kayhayen/Nuitka,tempbottle/Nuitka,kayhayen/Nuitka,wfxiang08/Nuitka,wfxiang08/Nuitka