[Ada] Don't unconditionally define _LARGEFILE_SOURCE

[Rainer Orth]

This patch

2014-08-01  Pascal Obry  <obry@adacore.com>

        * cstreams.c: Only enable large file support on know supported
        platforms. Add missing defines/includes.

broke Ada bootstrap on Solaris:

/vol/gcc/src/hg/trunk/local/gcc/ada/cstreams.c:34:0: error: "_LARGEFILE_SOURCE" redefined [-Werror]
 #define _LARGEFILE_SOURCE
 ^
<built-in>: note: this is the location of the previous definition

Fixed as follows, i386-pc-solaris2.10 bootstrap is past the failure now.

Ok for mainline?

	Rainer


2014-08-01  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/ada:
	* cstreams.c (_LARGEFILE_SOURCE): Guard definition.

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Rainer Orth, Center for Biotechnology, Bielefeld University