update the external codecs not to depend on 7z.dll

[ianamk]

if someone wants to try/use the codecs from Codecs.7z you'd also need to replace the 7z.dll
I really don't think this is a good idea as when 7zip updates you end-up with an obsolete dll nor is it necessary as there are other plugins for 7zip which add support for extra formats/codecs without the need to replace the main program dll for example
http://www.tc4shell.com/en/7zip/lzip/
http://www.tc4shell.com/en/7zip/asar/
http://www.tc4shell.com/en/7zip/wincrypthashers/
the above plugins work without replacing the 7z.dll

[ianamk]

my mistake I was installing the above plugins and they need to go in the formats directory so mistekenly I put your codecs in the formats instead of the plugins directory