fnlfmt: use included Makefile for build

Solves missing `fnlfmt` pagkage error since it is not being inlined

pkgs/development/tools/fnlfmt/default.nix

@@ -11,29 +11,15 @@ stdenv.mkDerivation rec {
     hash = "sha256-LYHhKC8iA4N8DdCH8GfSOkN/e+W3YjkFhVSDQraKoFk=";
   };
 
-  nativeBuildInputs = [ luaPackages.fennel ];
+  nativeBuildInputs = [ lua luaPackages.fennel ];
 
-  buildInputs = [ lua ];
+  makeFlags = [ "PREFIX=$(out)" ];
+  sourceRoot = [ "${src.name}/tags/${version}" ];
 
-  buildPhase = ''
-    runHook preBuild
-
-    echo "#!${lua}/bin/lua" > fnlfmt
-    ${luaPackages.fennel}/bin/fennel --require-as-include --compile tags/${version}/cli.fnl >> fnlfmt
-    chmod +x fnlfmt
-
-    runHook postBuild
-  '';
-
-  installPhase = ''
-    runHook preInstall
-    install -D ./fnlfmt $out/bin/fnlfmt
-    runHook postInstall
-  '';
-
-  meta = with lib; {
+  meta = with lib; rec {
     description = "Formatter for Fennel";
-    homepage = "https://git.sr.ht/~technomancy/fnlfmt";
+    homepage = "https://git.sr.ht/${src.owner}/${src.repo}";
+    changelog = "${homepage}/tree/${version}/changelog.md";
     license = licenses.lgpl3Plus;
     platforms = lua.meta.platforms;
     maintainers = with maintainers; [ chiroptical ];