[Ada] Remove GCC_ZCX_Support in system-*.ads

[Arnaud Charlet <charlet at adacore dot com>]

This constant was in fact useless as ZCX_By_Default implied it.

No change in behavior.

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

2011-08-29  Tristan Gingold  <gingold@adacore.com>

	* system-darwin-x86.ads, system-linux-s390x.ads, system-linux-alpha.ads,
	system-tru64.ads, system-irix-n32.ads, system-vxworks-arm.ads,
	system-linux-hppa.ads, system-linux-s390.ads,
	system-solaris-sparcv9.ads, system-mingw.ads, system-linux-ia64.ads,
	system-vms_64.ads, system-vxworks-sparcv9.ads, system-linux-ppc.ads,
	system-aix64.ads, system-lynxos-ppc.ads, system-linux-sh4.ads,
	system-solaris-x86.ads, system-linux-x86_64.ads, system-linux-x86.ads,
	system-vxworks-ppc.ads, system-hpux.ads, system-darwin-ppc.ads,
	system-solaris-sparc.ads, system-lynxos-x86.ads,
	system-vxworks-m68k.ads, system-hpux-ia64.ads, system-irix-o32.ads,
	system-solaris-x86_64.ads, system-mingw-x86_64.ads,
	system-vxworks-mips.ads, system-linux-sparc.ads, system-vms-ia64.ads,
	system-freebsd-x86.ads, system-aix.ads, system-darwin-x86_64.ads,
	system-vxworks-x86.ads: Remove GCC_ZCX_Support
	* s-taprop-posix.adb, s-taprop-irix.adb, s-taprop-vxworks.adb,
	s-taprop-tru64.adb, s-taprop-linux.adb, s-taprop-solaris.adb: Ditto.
	* opt.ads: Adjust comment.
	* targparm.ads, targparm.adb: Remove GCC_ZCX_Support_On_Target.
	* gnat1drv.adb: Do not check for GCC_ZCX_Support_On_Target.
	* system.ads: Move GCC_ZCX_Support to obsolete entries.

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