lv: 4.51 -> 4.51-unstable-2020-08-03, fix gcc-14 build

Without the change the build fails against `gcc-14` due to outdated
`./configure` script as
https://hydra.nixos.org/build/281834372/nixlog/3:

configure: error: installation or configuration problem: C compiler cannot create executables.

    configure:678:1: error: return type defaults to 'int' [-Wimplicit-int]
    configure: failed program was:

    main(){return(0);}

Fix the build by generating newer `./configure`.

While at it switched to the latest home page for `lv`.

pkgs/by-name/lv/lv/package.nix

@@ -1,23 +1,31 @@
 {
   lib,
   stdenv,
-  fetchurl,
+  fetchFromGitHub,
   ncurses,
+  unstableGitUpdater,
+  autoreconfHook,
 }:
 
 stdenv.mkDerivation rec {
   pname = "lv";
-  version = "4.51";
+  version = "4.51-unstable-2020-08-03";
 
-  src = fetchurl {
-    url = "mirror://debian/pool/main/l/${pname}/${pname}_${version}.orig.tar.gz";
-    sha256 = "0yf3idz1qspyff1if41xjpqqcaqa8q8icslqlnz0p9dj36gmm5l3";
+  src = fetchFromGitHub {
+    owner = "ttdoda";
+    repo = "lv";
+    rev = "1fb214d4136334a1f6cd932b99f85c74609e1f23";
+    hash = "sha256-mUFiWzTTM6nAKQgXA0sYIUm1MwN7HBHD8LWBgzu3ZUk=";
   };
 
   makeFlags = [ "prefix=${placeholder "out"}" ];
 
+  nativeBuildInputs = [ autoreconfHook ];
   buildInputs = [ ncurses ];
 
+  preAutoreconf = "cd src";
+  postAutoreconf = "cd ..";
+
   configurePhase = ''
     mkdir -p build
     cd build
@@ -28,9 +36,13 @@ stdenv.mkDerivation rec {
     mkdir -p $out/bin
   '';
 
+  passthru.updateScript = unstableGitUpdater {
+    tagPrefix = "v";
+  };
+
   meta = with lib; {
     description = "Powerful multi-lingual file viewer / grep";
-    homepage = "https://web.archive.org/web/20160310122517/www.ff.iij4u.or.jp/~nrt/lv/";
+    homepage = "https://github.com/ttdoda/lv";
     license = licenses.gpl2Plus;
     platforms = with platforms; linux ++ darwin;
     maintainers = with maintainers; [ kayhide ];