[Patch,Fortran] PR46122 Make PROTECT check less strict

[Tobias Burnus]

Currently, GCC rejects

   protected_pointer%pointer%var = 5

as the "protected_pointer" is protected. However, that only protects the 
pointer association status - but the example does not modify it - only 
the target of the pointer is modified, which is valid.

The solution is to do the same as with INTENT: Don't continue checking 
as soon as there is component-ref with a pointer component involved 
(which is not the last component-ref).

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

Tobias
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