[Ada] Do not warn about unused global declarations

[Eric Botcazou]

After the merge of the debug-early branch, the Ada compiler now issues 
warnings about unused global declarations (check_global_declaration is now 
invoked in Ada too).  That's undesirable, since the front-end proper already 
does it and its messages are superior.

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


2015-06-19  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/misc.c (LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL): Define.


-- 
Eric Botcazou
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