Posixify the locales name for variants

Posixify the locales name for variants

For all locales with variants:
- if no ambiguity on the locale (only one variant) just use the regular name
- if ambiguity, pick one as default and append @<variant> to the others
  respecting POSIX

As a result:
- All the 3 components locales added recently are renamed to the usual 2
  components version for all but sr_RS.UTF-8
- Set sr_RS.UTF-8 to the cyrillic variant
- Add sr_RS.UTF-8@latin
- Remove the symlinks aliases they were created to represent the 2 components
  version as aliasas and are now useless
- Update the OptionalObsoleteFiles.inc and ObsoleteFiles.inc to reflect those
  changes

Discussed with:	ache@
Approved by:	re@ (gjb)