unix/sysv/linux/bits/shm.h -> gnu/bits/shm.h

[Roland McGrath]

I would like to move the file sysdeps/unix/sysv/linux/bits/shm.h to
sysdeps/gnu/bits/shm.h, so that it will be used for the Hurd as well as
Linux.  Any objections?

You'll recall that sysdeps/gnu exists for things that are common to all GNU
systems (i.e. Linux and Hurd).

Since on the Hurd shm functionality is implemented (or will eventually be)
purely in the C library, and these types and bit values are purely parts of
the C library interface not directly related to any Hurd interfaces, there
is no need for the Hurd to define these structures in any particular way
and so it might as well share the same code used on Linux (just as with
utmp, which is also in sysdeps/gnu).