lib: hook libder up to the build

libder will be used in upcoming ECC support in the pkg(7) bootstrap to
read DER-encoded keys and signatures.

Differential Revision: https://reviews.freebsd.org/D481

lib: hook libder up to the build

libder will be used in upcoming ECC support in the pkg(7) bootstrap to
read DER-encoded keys and signatures.

Differential Revision: https://reviews.freebsd.org/D48116

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