I guess you have to build from the source (I don't know how to get the exact build but I think git allow it so if you are patient google for git usage)
http://git.rockbox.org/?p=rockbox.git;a=commit;h=223038d
Or you could use my build. I compiled and packed the package with "make fullzip" so it included with fonts. The only modification with the source is that I disable album artwork load so music files are loaded very fast and battery usage is increased too.
https://www.dropbox.com/s/ndnqdvn7eppsl38/rockbox-6g-223038d-removedalbumart.zip?dl=0
Thanks a lot, man. As I am at work now and the firewall blocks dropbox here, I will download at home, later. I really like album artwork, on the other hand, battery is much more important than beauty.