LU-17489 utils: fix 'lfs getname' ioctl breakage

LU-17489 utils: fix 'lfs getname' ioctl breakage

The removal of the explicit ioctl(OBD_IOC_GETNAME_OLD) fallback
in llapi_file_fget_lov_uuid() caused 'lfs getname' to break when
running against an 2.14 mountpoint missing OBD_IOC_GETDTNAME.

Change this to call llapi_ioctl(OBD_IOC_GETDTNAME) which handles
this compatibility mapping internally.

Also fix the include header ordering to ensure LUSTRE_VERSION_CODE
is defined before including lustre_ioctl_old.h.

Test-Parameters: trivial
Fixes: 0f38a0b9db ("LU-13107 uapi: remove obsolete ioctls")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I944acd498a42ba4882c8391e27f4156cb63ebbe5
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53867
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>