Fix PR ada/63310

[Eric Botcazou]

This fixes the -fcompare-debug bootstrap failure reported by Jakub.

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


2015-06-29  Eric Botcazou  <ebotcazou@adacore.com>

	PR ada/63310
	* gcc-interface/utils.c (gnat_write_global_declarations): Always
	build the dummy global variable if code was generated.

-- 
Eric Botcazou
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