[Ada] Use underscored preprocessor symbols in C files

[Eric Botcazou]

This changes 4 preprocessor symbols tested in the C files (linux, sun, i386 
and sparc) to their underscored variants.  Both forms are defined by the 
compiler in normal mode, but the former is not in strictly conformant mode and 
this is problematic on Solaris now.  The other preprocessor symbols tested 
already use an underscored form, modulo a couple of exceptions.

Tested on x86_64-suse-linux and i686-pc-solaris2.10, applied on the mainline.


2015-05-30  Eric Botcazou  <ebotcazou@adacore.com>

	* adaint.c: Test for __linux__ instead of linux and __sun__ instead
	of sun.  Add missing leading underscore to AIX.  Remove #elif 0.
	* adaint.h: Likewise.
	* cio.c: Likewise.
	* cstreams.c: Likewise.
	* env.c: Likewise.
	* gsocket.h: Likewise.
	* init.c: Likewise.  Test for __i386__ instead of i386.
	* link.c: Likewise.
	* s-oscons-tmplt.c: Likewise.
	* sysdep.c: Likewise.
	* terminals.c: Likewise.  Use BSD symbol instead of FREEBSD.
	* tracebak.c: Likewise.  Test for __sparc__ instead of sparc.


-- 
Eric Botcazou
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