dc-dc.lib not working with kicad 4.0.7

[aurel32]

Commit d89beba made many format changes to the dc-dc library and this causes the description, the keywords and the documentation fields to be empty for all devices in this library. It seems that just downgrading the version in the header from 2.4 to 2.3 fixes the issues, but I don't know if there other side effects.

[jkriege2]

I posted a fix: #1840

[aurel32]

Thanks, I confirm the fix works.