[Ada] Check redundant parens for conditional expressions

[Arnaud Charlet <charlet at adacore dot com>]

The style option -gnatyx checks for extra parentheses for
conditional expressions in IF and WHILE statements, but did
not apply to conditions in conditional expressions. This
patch makes it apply to this case as well:

The following should be compiled with -gnatyx

     1. pragma Ada_2012;
     2. package Condexx is
     3.    x : integer := (if (1 = 2) then 1 else 2);
                              |
        >>> warning: redundant parentheses

     4. end Condexx;

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

2010-09-10  Robert Dewar  <dewar@adacore.com>

	* par-ch4.adb (P_Conditional_Expression): Use P_Condition for condition
	* par-ch5.adb (P_Condition): Move from body to spec
	* par.adb (Ch5.P_Condition): Move from body to spec

Attachment: difs
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