PR modula2/116557 Remove physical address from the GPL header comment

PR modula2/116557 Remove physical address from the GPL header comment

This patch removes the physical address from all the header comments
in the m2 subdirectory.  The physical address is replaced with the
text "You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>." instead.

gcc/m2/ChangeLog:

	PR modula2/116557
	* gm2-lang.cc: Replace physical address with URL in GPL header.
	* gm2-lang.h: Ditto.
	* images/LICENSE.IMG: Ditto.
	* m2-tree.def: Ditto.
	* mc-boot/GIndexing.cc: Ditto.
	* mc-boot/Gkeyc.cc: Ditto.
	* mc-boot/Glists.cc: Ditto.
	* mc-boot/GmcComp.cc: Ditto.
	* mc-boot/GmcDebug.cc: Ditto.
	* mc-boot/GmcFileName.cc: Ditto.
	* mc-boot/GmcMetaError.cc: Ditto.
	* mc-boot/GmcOptions.cc: Ditto.
	* mc-boot/GmcPreprocess.cc: Ditto.
	* mc-boot/GmcPretty.cc: Ditto.
	* mc-boot/GmcPrintf.cc: Ditto.
	* mc-boot/GmcQuiet.cc: Ditto.
	* mc-boot/GmcReserved.cc: Ditto.
	* mc-boot/GmcSearch.cc: Ditto.
	* mc-boot/GmcStack.cc: Ditto.
	* mc/Indexing.mod: Ditto.
	* mc/keyc.mod: Ditto.
	* mc/lists.mod: Ditto.
	* mc/mcComp.mod: Ditto.
	* mc/mcDebug.mod: Ditto.
	* mc/mcFileName.mod: Ditto.
	* mc/mcMetaError.mod: Ditto.
	* mc/mcOptions.mod: Ditto.
	* mc/mcPreprocess.mod: Ditto.
	* mc/mcPretty.mod: Ditto.
	* mc/mcPrintf.mod: Ditto.
	* mc/mcQuiet.mod: Ditto.
	* mc/mcReserved.mod: Ditto.
	* mc/mcSearch.mod: Ditto.
	* mc/mcStack.mod: Ditto.
	* tools-src/buildpg: Ditto.
	* tools-src/calcpath: Ditto.
	* tools-src/checkmeta.py: Ditto.
	* tools-src/def2doc.py: Ditto.
	* tools-src/makeSystem: Ditto.
	* tools-src/tidydates.py: Ditto.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>