[Ada] Adjust path names in debug info

[Eric Botcazou]

This ensures the path names in the debug info of the library are consistent 
with those of libgcc.

Tested on x86_64-suse-linux, applied on the mainline.


2013-10-19  Thomas Quinot  <quinot@adacore.com>

	* gcc-interface/Makefile.in: Use canonical absolute path to refer to
	the top source directory and to the libgcc subidrectories.


-- 
Eric Botcazou
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