Copy linux/list.h from wendelin.core which copied it from
util-linux.git which took it from linux.git at LGPL license state.

Here are corresponding links for wendelin.core and util-linux:

    wendelin.core@a0f940ad
    https://git.kernel.org/cgit/utils/util-linux/util-linux.git/tree/include/list.h?id=v2.25-165-g9138d6f

Linked lists will be used in channels implementation in the next patch.