new linux chown

[Matt McLean]

looking at uli's sysdeps/unix/sysv/linux/i386/chown.c,

it seems to me that it shouldn't be an architecture dependant file. from
what i can tell, right now the alpha, i386, mips, and ppc kernels are all 
aware of the new chown (and the old one being renamed lchown). rather than 
putting one in each directory, it should be moved to the general linux
sysdeps, and then only the needed syscalls.list should be made aware. what
do you guys think?

-matt