hping: fix cross

hping tries to run a compiled binary to detect endianness, and also
runs the end-product of the build process with `-v` for some reason
after the build completes.

This commit addresses both of these behaviors.

Tested on:
- [x] mips64el-linux-gnu (cross from x86_64-linux)
- [x] aarch64-linux-gnu (cross from x86_64-linux)

pkgs/tools/networking/hping/default.nix

···
   '' + lib.optionalString stdenv.isLinux ''
     sed -i -e 's|#include <net/bpf.h>|#include <pcap/bpf.h>|' \
       libpcap_stuff.c script.c
+  '' + lib.optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    substituteInPlace configure --replace 'BYTEORDER=`./byteorder -m`' BYTEORDER=${
+      {
+        littleEndian = "__LITTLE_ENDIAN_BITFIELD";
+        bigEndian = "__BIG_ENDIAN_BITFIELD";
+      }.${stdenv.hostPlatform.parsed.cpu.significantByte.name}}
+    substituteInPlace Makefile.in --replace './hping3 -v' ""
   '';
 
   configureFlags = [ (if withTcl then "TCLSH=${tcl}/bin/tclsh" else "--no-tcl") ];