build failures after readdir changes

[David Miller]

Roland, the sparc 32-bit build started failing because there are still
references to the old sysdeps/unix/ locations of the moved readdir
implementation files.

It happens in linux and linux/i386 specific files, so I'm having a
hard time seeing how you didn't hit or notice this as well:

sysdeps/unix/sysv/linux/i386/readdir64_r.c:#include <sysdeps/unix/readdir_r.c>
sysdeps/unix/sysv/linux/i386/readdir64_r.c:#include <sysdeps/unix/readdir_r.c>
sysdeps/unix/sysv/linux/readdir64_r.c:#include <sysdeps/unix/readdir_r.c>

These all need to be fixed up to include sysdeps/posix/readdir_r.c,
the new location for this file.

This also means that what you ended up merging into master was
different from what I tested successfully on your branch.

Do I remember correctly you mentioning making some last minute changes
before actually doing the merge?