Misc: Fix Gem::all_load_paths method broken in rubygems 1.8.15

This is a monkey patch for the issue described at
https://github.com/rubygems/rubygems/issues/171

Signed-off-by: Tim Serong <tserong@suse.com>
Doc: Update ChangeLog (again)

Signed-off-by: Tim Serong <tserong@suse.com>