rzip: fix build

The pregenerated configure script is too old and fails with:

```
configure:658:1: error: return type defaults to 'int' [-Wimplicit-int]
  658 | main(){return(0);}
```

pkgs/by-name/rz/rzip/package.nix

@@ -4,6 +4,7 @@
   fetchurl,
   fetchpatch,
   bzip2,
+  autoreconfHook,
 }:
 
 stdenv.mkDerivation rec {
@@ -14,6 +15,8 @@ stdenv.mkDerivation rec {
     url = "mirror://samba/rzip/rzip-${version}.tar.gz";
     sha256 = "4bb96f4d58ccf16749ed3f836957ce97dbcff3e3ee5fd50266229a48f89815b7";
   };
+
+  nativeBuildInputs = [ autoreconfHook ];
   buildInputs = [ bzip2 ];
 
   patches = [
@@ -24,8 +27,6 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-error=implicit-int";
-
   meta = with lib; {
     homepage = "https://rzip.samba.org/";
     description = "Compression program";