qemu: Fix building with 6.2 kernel headers

qemu: Fix building with 6.2 kernel headers

When building native qemu with 6.2 kernel headers, qemu fails to build:

 In file included from /usr/include/linux/btrfs.h:29,
                  from ../qemu-7.2.0/linux-user/syscall.c:165:
 /usr/include/linux/fs.h:50:8: error: redefinition of ‘struct file_clone_range’
    50 | struct file_clone_range {
       |        ^~~~~~~~~~~~~~~~
 ../qemu-7.2.0/linux-user/syscall.c:129:8: note: originally defined here
   129 | struct file_clone_range {
       |        ^~~~~~~~~~~~~~~~

Backport changes to linux-user that remove the local copy of struct
file_clone_range.

Patches from https://lore.kernel.org/qemu-devel/20230110174901.2580297-1-berrange@redhat.com/

Signed-off-by: Joel Stanley <joel@jms.id.au>
Tested-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>