Merge EXTENDED_IO_STACK_LOCATION into IO_STACK_LOCATION and fix the resulting errors.
drwxr-xr-x - freeldr
drwxr-xr-x - msvc6
drwxr-xr-x - os2
drwxr-xr-x - posix
drwxr-xr-x - reactos
drwxr-xr-x - rosapps