arla 0.12 has missing modversions.h

[A.J.Martin]

Hi Assar, 
          this may be trivial, but recent versions of xfs/linux/xfs_locl.h  
have not included the header file <linux/modversions.h>. 
On RedHat 5.1, at least, the resulting xfs.o module won't load if this is 
missing (many unresolved kernel syms).

cheers,

Alex Martin