Diagnostic for module importation

[Nathan Sidwell]

This tweaks the	'included from ...' printing to	deal with imports in
the 'include' path.  One new thing is that there can now be two
'include' names on a single line.  For example 'in module X, included
at Y'.  This reads better than placing them on different lines.

         gcc/
         * diagnostic.c (diagnostic_report_current_module): Adjust for C++
         module importation.

pushing to trunk

-- 
Nathan Sidwell
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