[Ada] Missing error on illegal categorization dependency

[Pierre-Marie de Rodat]

This patch modifies the analysis of subprogram declarations to ensure that an
aspect which is converted into a categorization pragma is properly taken into
account when verifying the dependencies of a subprogram unit.

------------
-- Source --
------------

--  pack.ads

package Pack is end Pack;

--  proc1.ads

with Pack;

procedure Proc1 with Pure;

--  proc2.ads

with Pack;

procedure Proc2;
pragma Pure (Proc2);

----------------------------
-- Compilation and output --
----------------------------

$ gcc -c proc1.ads
$ gcc -c proc2.ads
proc1.ads:1:06: cannot depend on "Pack" (wrong categorization)
proc1.ads:1:06: pure unit cannot depend on non-pure unit
proc2.ads:1:06: cannot depend on "Pack" (wrong categorization)
proc2.ads:1:06: pure unit cannot depend on non-pure unit

Tested on x86_64-pc-linux-gnu, committed on trunk

2018-05-22  Hristian Kirtchev  <kirtchev@adacore.com>

gcc/ada/

	* sem_ch6.adb (Analyze_Subprogram_Declaration): Set the proper
	categorization of the unit after processing the aspects in case one of
	its aspects is converted into a categorization pragma.
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