libecc is not intended to be general use, other applications should
really be using openssl. pkg(7) uses libecc to align with the pkg(8)
project and its goals. This will be used in the upcoming support for
ECC in pkg(7).
(Note that the import is omitted because the resulting diff is large due to one or two files that I'm not yet committed to trimming... just <picture vendor/libecc being merged into crypto/libecc here>)