dnstop: add new package

Signed-off-by: Ken Xu <windedge99@gmail.com>

net/dnstop/Makefile

@@ -0,0 +1,35 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=dnstop
+PKG_RELEASE:=1
+
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL:=https://github.com/measurement-factory/dnstop.git
+PKG_SOURCE_DATE:=2018-05-22
+PKG_SOURCE_VERSION:=a5a5d2e2ca9a433bb8f017682ac6f2085741bdf8
+PKG_MIRROR_HASH:=1fe443c6faf1726aeb86a53a3a44efce23cad604304036371e76ff020eb0dac2
+
+PKG_MAINTAINER:=Ken Xu <windedge99@gmail.com>
+PKG_LICENSE:=NLPL
+PKG_LICENSE_FILES:=LICENSE
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/dnstop
+  SECTION:=net
+  CATEGORY:=Network
+  DEPENDS:=+libpcap +libncurses
+  TITLE:=stay on top of your dns traffic
+  URL:=http://dns.measurement-factory.com/tools/dnstop/
+endef
+
+define Package/dnstop/description
+ dnstop is a libpcap application (like tcpdump) that displays various tables of DNS traffic on your network
+endef
+
+define Package/dnstop/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/dnstop $(1)/usr/bin/
+endef
+
+$(eval $(call BuildPackage,dnstop))

net/dnstop/patches/100-fix_udphdr_error.patch

@@ -0,0 +1,14 @@
+--- a/dnstop.c
++++ b/dnstop.c
+@@ -71,11 +71,6 @@ static const char *Version = "@VERSION@"
+ #define ETHERTYPE_IPV6 0x86DD
+ #endif
+ 
+-#if defined(__linux__) || defined(__GLIBC__) || defined(__GNU__)
+-#define uh_dport dest
+-#define uh_sport source
+-#endif
+-
+ typedef struct {
+     inX_addr src;
+     int count;