Documentation/README.x86.md:
As above.
Move the the bit about x86-64 not being affected by the issue
described in this file from the bottom to the top.
Documentation/README.Linux.md:
Add a pointer to the README.x86.md file.
README.md:
Conform to the above change.
Documentation/README.Linux-m68k.md:
As above.
Mention that this port has not been tested (to the best of my knowledge)
since 1998.
Documentation/README.Linux.md:
Add a link to the Linux/m68k README.
README.md:
Update a link.