It's renamed to gwlib/gw_uuid.{c,h} but it's just the same interface afaics.
Nope, interface is not the same with the one exported by dev-libs/ossp-uuid. Closed as INVALID.
Who said anything about ossp-uuid? sys-libs/e2fsprogs-libs (/usr/lib/libuuid.so)
Fixed in kannel-1.4.3.