Glibc locale sub-packaging implementation options and associated issues

Fedora 23 schedule

Use folders for the locales instead of locale-archive.

Pros
- Makes the splitting much easier, no file conflicts
- No file conflicts
- No need to merge stuff into a locale-chive or delete it from there
- No problems with usr define locales, they are left alone as long as their folder does not have exactly the same name as a system locale
- Easier to use with an xdg-app runtime: https://lists.fedoraproject.org/pipermail/devel/2015-June/211630.html
- User locales and system locales can be mixed using LOCPATH
Cons
- More stats and mmaps when an application starts: If a locale-archive is used, only that file is opened and mmapped. With the folder structure, around 15 files/folders are tried to open and 13 small LC_* files are mmapped instead of mmapping only one huge locale-archive file. For a small program like “date” which does not do much and is dominated by startup time, this makes it run twice as slow.