[Ada] Remove again obsolete constant

[Eric Botcazou]

In the series of obsolete stuff that has managed to sureptitiously creep back 
up, there is the Functions_Return_By_DSP constant in system-*.ads files.  It 
was totally eliminated at some point during 4.3 development then reintroduced 
in some new files.

Applied on all active branches.


2009-03-31  Eric Botcazou  <ebotcazou@adacore.com>

	* system-linux-alpha.ads (Functions_Return_By_DSP): Remove.
	* system-linux-mips.ads (Functions_Return_By_DSP): Likewise.
	* system-linux-mipsel.ads (Functions_Return_By_DSP): Likewise.
	* system-linux-s390.ads (Functions_Return_By_DSP): Likewise.
	* system-linux-s390x.ads (Functions_Return_By_DSP): Likewise.
	* system-linux-sparc.ads (Functions_Return_By_DSP): Likewise.
	* system-linux-sparcv9.ads (Functions_Return_By_DSP): Likewise.

-- 
Eric Botcazou
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