Makefile.in: Make "depend" target quieter

This change avoids printing a long list of sources.

Author: fxlb

Makefile.in

@@ -561,7 +561,8 @@ testlist:
 	echo $(TEST_DIST)
 
 depend:
-	$(MKDEP) -c "$(CC)" -m "$(DEPENDENCY_CFLAG)" -s "$(srcdir)" $(DEFS) $(INCLS) $(SRC) $(LIBNETDISSECT_SRC)
+	@echo $(MKDEP) -c "$(CC)" -m "$(DEPENDENCY_CFLAG)" -s "$(srcdir)" $(DEFS) $(INCLS) $(SRC) '<libnetdissect src list>'
+	@$(MKDEP) -c "$(CC)" -m "$(DEPENDENCY_CFLAG)" -s "$(srcdir)" $(DEFS) $(INCLS) $(SRC) $(LIBNETDISSECT_SRC)
 
 shellcheck:
 	shellcheck -f gcc -e SC2006 build.sh build_matrix.sh build_common.sh