[Ada] Update header of front-end files

[Ada] Update header of front-end files

gcc/ada/

	* alloc.ads, aspects.adb, aspects.ads, atree.adb, atree.ads,
	casing.adb, casing.ads, csets.adb, csets.ads, debug.adb, debug.ads,
	einfo.adb, einfo.ads, elists.adb, elists.ads, fname.adb, fname.ads,
	gnatvsn.adb, gnatvsn.ads, hostparm.ads, indepsw-aix.adb,
	indepsw-darwin.adb, indepsw-gnu.adb, indepsw.adb, indepsw.ads,
	krunch.adb, krunch.ads, lib-list.adb, lib-sort.adb, lib.adb, lib.ads,
	namet-sp.adb, namet-sp.ads, namet.adb, namet.ads, nlists.adb,
	nlists.ads, opt.adb, opt.ads, output.adb, output.ads, rident.ads,
	scans.adb, scans.ads, scil_ll.adb, scil_ll.ads, sem_aux.ads,
	sem_aux.adb, sfn_scan.adb, sinfo.adb, sinfo.ads, sinput.adb,
	sinput.ads, snames.adb-tmpl, snames.ads-tmpl, stand.ads,
	stringt.adb, stringt.ads, table.adb, table.ads, types.adb,
	types.ads, uintp.adb, uintp.ads, uname.adb, uname.ads,
	urealp.adb, urealp.ads, vast.adb, vast.ads, widechar.adb,
	widechar.ads: Update header.