loader: add target for dirdeps build

Update dependencies for the loader variations used for each
architecture.

Reviewed by: sjg
Differential Revision: https://reviews.freebsd.org/D39741

(cherry pi

loader: add target for dirdeps build

Update dependencies for the loader variations used for each
architecture.

Reviewed by: sjg
Differential Revision: https://reviews.freebsd.org/D39741

(cherry picked from commit 2008043f386721d58158e37e0d7e50df8095942d)

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