armv7 targeting via poudriere-devel: devel/ocaml-opam fails to build for: No rule to make target 'armv7.o', needed by 'libasmrun.a'

[Mark Millard]

Note: This was using an armv7 poudriere jail on a aarch64 machine able to
run armv7 code.

gmake[4]: *** No rule to make target 'armv7.o', needed by 'libasmrun.a'.  Stop.
gmake[4]: Leaving directory 
'/wrkdirs/usr/ports/devel/ocaml-opam/work/opam-full-2.1.2/bootstrap/ocaml-4.12.1/runtime'

===
Mark Millard
marklmi at yahoo.com