shorten lyonpotpourri to lyon in Makefile to match the new submodule name...

shorten lyonpotpourri to lyon in Makefile to match the new submodule name (which itself was changed to match Pd-l2ork)

externals/Makefile

@@ -1174,7 +1174,7 @@ loaders-libdir_clean:
 
 #------------------------------------------------------------------------------#
 # LYON
-LYON_NAME=lyonpotpourri
+LYON_NAME=lyon
 
 lyonpotpourri:
 	make -C $(externals_src)/$(LYON_NAME) PD_PATH=$(pd_src)