Missing countries in _country_get_predefined_list

While working on a site i noticed the country Kosovo was missing in Drupal 7 in the _country_get_predefined_list() function. Upon research i noticed CountryManager in Drupal 8 has Kosovo in it's list, while i only need Kosovo myself i conducted a small research to see what else is missing.

Research

I started comparing the lists between 7 & 8 and came with the following result:

• Drupal 7 contains 250 countries.
• Drupal 8 contains 258 countries.
• All the countries in Drupal 7, are included in Drupal 8.
• There are 7 countries missing in drupal 7, which are included in Drupal 8.

The 7 countries missing in Drupal 7 are:

Proposal

My proposal is to add these to the _country_get_predefined_list() function, so drupal 7 is up-to-date with these countries. I included a patch file with the countries added.