net-snmp: remove autoreconfHook

Usually we can use the configure scripts included in the release tarball. This
was added in 552143224a8c0475b116d185a3b67d4cf5e0dfcd almost 10 years ago to
fix the build, but is no longer necessary.

pkgs/servers/monitoring/net-snmp/default.nix

···
-{ lib, stdenv, fetchurl, fetchpatch, autoreconfHook, removeReferencesTo
+{ lib, stdenv, fetchurl, fetchpatch, removeReferencesTo
 , file, openssl, perl, perlPackages, nettools
 , withPerlTools ? false }: let
 
···
     substituteInPlace testing/fulltests/support/simple_TESTCONF.sh --replace "/bin/netstat" "${nettools}/bin/netstat"
   '';
 
-  nativeBuildInputs = [ autoreconfHook nettools removeReferencesTo file ];
+  nativeBuildInputs = [ nettools removeReferencesTo file ];
   buildInputs = [ openssl ]
     ++ lib.optional withPerlTools perlWithPkgs;