math/elpa: Update 2019.05.002 -> 2021.11.001

A special hack is used to build this port because
GNU Makefiles don't build components in proper order by default,
and .mod files are built only after they are used.

It was broken for a long while for this reason.

(cherry picked from commit 935ebd18187e109c940bd6a3e2a7eea2ee7b56cf)