Remove NLS message catalog implementation for pre-2.0 OSF

Remove NLS message catalog implementation for pre-2.0 OSF

fstrace had its own copy of the NLS catopen/catgets/catclose library
functions only on OSF platforms prior to 2.0 with the functions
renamed to add a "1" (which looked cut and pasted from somewhere
else).  This is old enough that we no longer support that platform,
so drop all of that code and partly untangle the #ifdefs to remove
the pre-2.0 OSF case.

Reviewed-on: http://gerrit.openafs.org/88
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Verified-by: Simon Wilkinson <sxw@inf.ed.ac.uk>