Clarify variables
@lillolollo As said in IRC, after the CLANG migration the universal variables (see the title of the commit) stopped to work on Windows due to MSYS2.
To clarify this, I added a observation in Windows page
@lillolollo As said in IRC, after the CLANG migration the universal variables (see the title of the commit) stopped to work on Windows due to MSYS2.
To clarify this, I added a observation in Windows page