Dear all,

this patch fixes a regression which was a side-effect of r14-8947,
losing the length of a deferred-length character variable when
passed as a dummy.

The new testcase provides a workout for deferred length to improve
coverage in the testsuite.  Another temporarily disabled test was
re-enabled.

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

Thanks,
Harald