[tests] Fix the mcs-compileall target in runtime/ (#4637)

[tests] Fix the mcs-compileall target in runtime/ (#4637)

It is used as the "verify" step on Jenkins/Wrench and I noticed
it didn't run recently.

Looks like it was broken a while ago by 695e8f53ae7d2139.
Moving the verifiable_files variable at the top is wrong since
the $$profile variable is only defined inside the for loop and
so we'd get an empty list.

When that was fixed it still didn't work as piping to `echo`
doesn't work. Replaced it with a Makefile solution instead.