testsuite: Adjust pruning

[Nathan Sidwell]

Here is	the patch to adjust the	include-stack pruning messages to also
strip out c++ modules.	The ICE	regexp was a little too	strict such
that if someone overrides the bug-reporting URL	it doesn't trigger.
May as well relax it too.

         gcc/testsuite/
         * lib/prune.exp (prune_gcc_output): Adjust include stack pruning
         for modules.
         (print_ices): Relax regexp.

pushing to trunk

nathan
-- 
Nathan Sidwell
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