[Ada] Handling of hyper empty arrays in GNAT.Sockets.Write (PR 35953)

[Arnaud Charlet <charlet at adacore dot com>]

This change fixes the behaviour of the Write primitive of the socket-based
stream types provided by GNAT.Sockets to avoid raising an exception when
writing an empty array with 'Last < 'First - 1.

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

2009-04-17  Thomas Quinot  <quinot@adacore.com>

	PR ada/35953

	* g-socthi-vms.adb, g-socthi-vms.ads, g-socthi-vxworks.adb,
	g-socthi-vxworks.ads, g-socthi-mingw.adb, g-socthi-mingw.ads,
	g-socthi.adb, g-stsifd-sockets.adb, g-socthi.ads, g-socket.adb,
	g-socket.ads (GNAT.Sockets.Thin.C_Send,
	GNAT.Sockets.Thin.Syscall_Send): Remove unused subprograms.
	Replace calls to send(2) with equivalent sendto(2) calls.
	(GNAT.Sockets.Send_Socket): Factor common code in inlined subprogram.
	(GNAT.Sockets.Write): Account for the case of hyper-empty arrays, do not
	report an error in that case. Factor code common to the two versions
	(datagram and stream) in common routine Stream_Write.

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