decl.c (gnat_to_gnu_entity): Do not make a function returning an unconstrained type 'const' for the middle-end.

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Function>: Do not make
	a function returning an unconstrained type 'const' for the middle-end.

	* gcc-interface/trans.c (Pragma_to_gnu) <case Pragma_Warning>: Use
	exact condition to detect Reason => "..." pattern.

From-SVN: r221916