[libcpp] maybe canonicalize system paths in line-map

[Manuel López-Ibáñez]

New version of the patch. Bootstrapped and regression tested.

Is this version OK?


2012-04-29  Manuel López-Ibáñez  <manu@gcc.gnu.org>
	    Dodji Seketeli  <dodji@seketeli.org>

	PR 5297
	* libcpp/files.c (maybe_shorter_path): New.
	(find_file_in_dir): Use it.
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