[Patch, Fortran] (Coarray) Fix constraint checks for LOCK_TYPE

[Tobias Burnus]

Tobias Burnus wrote:
> Mikael, first, thanks for carefully reading the patch!

Updated patch attached. Changes:
- parse.c: Cleaned up a bit, use suggested wording, add missing 
diagnostic (cf. my previous mail)
- resolve.c: use suggested wording
- coarray_lock_5.f90: Remove.
- coarray_lock_6.f90: Move to coarray_lock_5.f90, add additional test 
case for the newly found issue.

Build and regtested on x86-64-linux.
OK for the trunk?

Tobias
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