Make the extra dependencies in DPADD be dependencies of PROG_FULL
and SHLIB_NAME_FULL so that binary is relinked when a dependency changes.
Right now the existing full binary is left as-is and only the objcopy
to remove debug symbols is run.

Change a library an existing binary depends on (e.g. libstand.a) and
re-build a binary that depends on it (e.g. loader.efi).