[Ada] Make sure generated files are created first

[Eric Botcazou]

As reported by Alan L., we need to make sure that the generated files are 
created before gigi is compiled.

Tested on x86_64-suse-linux, applied on all branches.


2015-10-09  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/Make-lang.in: Make sure that GNAT1_OBJS and not just
	GNAT1_ADA_OBJS are compiled only after generated files are created.


-- 
Eric Botcazou
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