Dear all,

the attached patch, which is based on a draft by Tobias, fixes
an old rejects-valid issue with rank checking for CLASS arrays
by using the proper array spec of CLASS variables.

The testcase covers only non-coarray cases, as playing with
coarray variants hit pre-exisiting issues in gfortran that
are very likely unrelated to the interface checks.  I consider
this rather as post 13-release stuff.

Regtested on x86_64-pc-linux-gnu.  OK for mainline?

Thanks,
Harald