vnstat: update to v1.16

Updates vnStat to the latest stable version, drops obsolete patches.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

net/vnstat/patches/003-no_install_uname.patch

@@ -1,15 +0,0 @@
---- a/Makefile
-+++ b/Makefile
-@@ -33,12 +33,6 @@ debug:
- install:
- 	@echo "Installing vnStat..."
- 
--# check that system is really Linux
--	@if [ `uname` != "Linux" ]; \
--	then echo "This isn't a Linux system. Maybe 'make bsdinstall' is what you need?"; \
--	false; \
--	fi
--
- # check that there's something to install
- 	@if [ ! -f "src/vnstat" ] || [ ! -f "src/vnstatd" ]; \
- 	then echo "Nothing to install, run make first."; \