Please revert immediately.
Please write on the chalkboard 100 times: "I will not add ebuilds as maintainer-needed".
This is in fact a newer version of liblinebreak (under a new name). liblinebreak is m-n.
This new version improves the functionality of fbreader (the new revision -r4 depends on libunibreak). Removing libunibreak would require also removing the improved fbreader-0.99.4-r4.