legal-info: add hash for our own license file

This silences the annoying warning that there is no hash file for our
own COPYING file.

Also change the message so that it is more obvious what we're doing.

Reported-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
diff --git a/Makefile b/Makefile
index 0827c4e..a22e87f 100644
--- a/Makefile
+++ b/Makefile
@@ -744,8 +744,8 @@
 
 .PHONY: legal-info-prepare
 legal-info-prepare: $(LEGAL_INFO_DIR)
-	@$(call MESSAGE,"Collecting legal info")
-	@$(call legal-license-file,buildroot,buildroot,.,COPYING,COPYING,HOST)
+	@$(call MESSAGE,"Buildroot $(BR2_VERSION_FULL) Collecting legal info")
+	@$(call legal-license-file,buildroot,buildroot,support/legal-info,COPYING,COPYING,HOST)
 	@$(call legal-manifest,PACKAGE,VERSION,LICENSE,LICENSE FILES,SOURCE ARCHIVE,SOURCE SITE,TARGET)
 	@$(call legal-manifest,PACKAGE,VERSION,LICENSE,LICENSE FILES,SOURCE ARCHIVE,SOURCE SITE,HOST)
 	@$(call legal-manifest,buildroot,$(BR2_VERSION_FULL),GPL-2.0+,COPYING,not saved,not saved,HOST)