makefile: remove custom samba specifics var from nightly variant

Setting this value to what is now the default in the containerfile makes
no difference. We can remove it.

Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

Makefile

@@ -69,7 +69,6 @@ build-nightly-server: $(BUILDFILE_NIGHTLY_SERVER)
 $(BUILDFILE_NIGHTLY_SERVER): Makefile $(SERVER_SRC_FILE) $(SERVER_SOURCES)
 	$(BUILD_CMD) \
 		--build-arg=INSTALL_PACKAGES_FROM="samba-nightly" \
-		--build-arg=SAMBA_SPECIFICS="daemon_cli_debug_output" \
 		--tag $(NIGHTLY_SERVER_NAME) --tag $(NIGHTLY_SERVER_REPO_NAME) \
 		-f $(SERVER_SRC_FILE) $(SERVER_DIR)
 	$(CONTAINER_CMD) inspect -f '{{.Id}}' $(NIGHTLY_SERVER_NAME) > $(BUILDFILE_NIGHTLY_SERVER)