PR ada/18692
	* lib/gnat.exp: New file.
	* lib/gnat-dg.exp: Likewise.
	* gnat.dg: New directory.
	* gnat.dg/dg.exp: New driver.
	* gnat.dg/specs: New directory.
	* gnat.dg/specs/specs.exp: New driver.
	* gnat.dg/style: New directory.
	* gnat.dg/style/style.exp: New driver.


Co-Authored-By: Eric Botcazou <ebotcazou@adacore.com>

From-SVN: r114805