netsniff-ng: Fix build against glibc 2.26

The build fails first of all because it cannot find the function body
for __builtin_memset. In glibc 2.26 this is available via inclusion of
string.h.

Another failure was that UINT64_MAX wasn't available in staging/tools.c,
which is fixed again by inclusion of stdint.h.

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @nckx

pkgs/tools/networking/netsniff-ng/default.nix

@@ -14,6 +14,8 @@ stdenv.mkDerivation rec {
     sha256 = "1lz4hwgwdq3znlqjmvl7cw3g3ilbayn608h0hwqdf7v2jq6n67kg";
   };
 
+  patches = [ ./glibc-2.26.patch ];
+
   buildInputs = [ bison flex geoip geolite-legacy libcli libnet libnl
     libnetfilter_conntrack libpcap libsodium liburcu ncurses perl
     pkgconfig zlib ];

pkgs/tools/networking/netsniff-ng/glibc-2.26.patch

@@ -0,0 +1,24 @@
+diff --git a/built_in.h b/built_in.h
+index da04dbd..7acc183 100644
+--- a/built_in.h
++++ b/built_in.h
+@@ -10,6 +10,7 @@
+ #include <endian.h>
+ #include <byteswap.h>
+ #include <asm/byteorder.h>
++#include <string.h>
+ 
+ typedef uint64_t	u64;
+ typedef uint32_t	u32;
+diff --git a/staging/tools.c b/staging/tools.c
+index 9d2d1be..909b059 100644
+--- a/staging/tools.c
++++ b/staging/tools.c
+@@ -55,6 +55,7 @@
+ ////////////////////////////////////////////////////////////////////////////////////////////
+ 
+ #include "mz.h"
++#include <stdint.h>
+ 
+ #define CMP_INT(a, b) ((a) < (b) ? -1 : (a) > (b))
+ #define IPV6_MAX_RANGE_LEN strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff-ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128")