dnstop: add new package

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

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;