The SPARK containers are now maintained under the spark2014 repository.
This change replaces the implementation of SPARK containers by a
pragma Compile_Time_Error, pointing the users WITHing the libraries
to their new location.

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

gcc/ada/

	* Makefile.rtl: Remove SPARK containers filenames.
	* impunit.adb: Remove SPARK containers packages names.
	* libgnat/a-cfdlli.adb, libgnat/a-cfdlli.ads: Remove content and
	add pragma Compile_Time_Error with suitable message.
	* libgnat/a-cfhama.adb, libgnat/a-cfhama.ads: Likewise.
	* libgnat/a-cfhase.adb, libgnat/a-cfhase.ads: Likewise.
	* libgnat/a-cfidll.adb, libgnat/a-cfidll.ads: Likewise.
	* libgnat/a-cfinse.adb, libgnat/a-cfinse.ads: Likewise.
	* libgnat/a-cfinve.adb, libgnat/a-cfinve.ads: Likewise.
	* libgnat/a-cforma.adb, libgnat/a-cforma.ads: Likewise.
	* libgnat/a-cforse.adb, libgnat/a-cforse.ads: Likewise.
	* libgnat/a-cofove.adb, libgnat/a-cofove.ads: Likewise.
	* libgnat/a-cofuma.adb, libgnat/a-cofuma.ads: Likewise.
	* libgnat/a-cofuse.adb, libgnat/a-cofuse.ads: Likewise.
	* libgnat/a-cofuve.adb, libgnat/a-cofuve.ads: Likewise.
	* libgnat/a-cofuba.adb, libgnat/a-cofuba.ads: Remove package.

gcc/testsuite/

	* gnat.dg/aspect2.adb: Removed.
	* gnat.dg/aspect2.ads: Removed.
	* gnat.dg/config_pragma1.adb: Removed.
	* gnat.dg/config_pragma1_pkg.ads: Removed.
	* gnat.dg/equal8.adb: Removed.
	* gnat.dg/equal8.ads: Removed.
	* gnat.dg/equal8_pkg.ads: Removed.
	* gnat.dg/formal_containers.adb: Removed.
	* gnat.dg/iter1.adb: Removed.
	* gnat.dg/iter1.ads: Removed.