change the nt service pack version from 6 to 6a, correct win2k3 name

[Ivan Leo Puoti]

I'm not 100% sure this patch is correct, please let me know if it isn't. 
BTW at line 342 of dlls/ntdll/version.c I read /* FIXME: Not sure, should be
verified with a Win2K3 dll */
how can this be verified?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: =?iso-8859-1?Q?version.diff?=
Type: application/octet-stream
Size: 790 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20040728/4c02d22c/iso-8859-1Qversion.obj