[Ada] Fix debug info for character subtypes

[Eric Botcazou]

This fixes a regression present on the mainline and 6 branch for the debug 
info of character subtypes, whose bounds are output as signed instead of 
unsigned values as per the language.

Tested on x86_64-suse-linux, applied on the mainline and 6 branch.


2016-12-07  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Enumeration_Subtype>:
	Also call finish_character_type on Character subtypes.
	* gcc-interface/utils.c (finish_character_type): Deal with subtypes.

-- 
Eric Botcazou
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