updated Makefile so that CERT defines the path to the public CA certificate...

updated Makefile so that CERT defines the path to the public CA certificate instead of its directory. It makes more sense and is more consistent with the rest of the build process (notably live-exam-iso)

Makefile

@@ -255,7 +255,7 @@ help_client:
 	@echo "                      Require LOGIN variable. Example:"
 	@echo ""
 	@echo "────────────────────────────────────────────────────────────────────────────────"
-	@echo "  CERT:   directory where the public CA certificate resides ($(CA_CERT_FILE))."
+	@echo "  CERT:   path to public CA certificate file ($(CA_CERT_FILE))."
 	@echo "  SERVER: server ip address and port, separated by a colon,"
 	@echo "          for instance: SERVER=127.0.0.1:1077"
 
@@ -263,7 +263,7 @@ copy_resources_client:
 	@mkdir -p $(RESOURCES_DIR_CLIENT)
 	@echo -n "$(SERVER)" > $(RESOURCES_DIR_CLIENT)/server
 ifdef CERT
-	@cp $(CERT)/$(CA_CERT_FILE) $(RESOURCES_DIR_CLIENT)
+	@cp $(CERT) $(RESOURCES_DIR_CLIENT)/
 else
 	@echo -n "" > $(RESOURCES_DIR_CLIENT)/$(CA_CERT_FILE)
 endif