netperf: remove libsmbios on non-x86

This fixes building on ARM systems.

(cherry picked from commit a94c9ad2de2037ba5565aac6cdccb2cd6a7dc27f)

pkgs/applications/networking/netperf/default.nix

···
     sha256 = "0wfj9kkhar6jb5639f5wxpwsraxw4v9yzg71rsdidvj5fyncjjq2";
   };
 
-  buildInputs = [ libsmbios ];
+  buildInputs = stdenv.lib.optional (stdenv.hostPlatform.isx86) libsmbios;
   nativeBuildInputs = [ autoreconfHook ];
   autoreconfPhase = ''
     autoreconf -i -I src/missing/m4