exa: add gitSupport input parameter...

for a more convenient way to configure the package.

pkgs/tools/misc/exa/default.nix

@@ -1,5 +1,15 @@
-{ lib, stdenv, fetchFromGitHub, rustPlatform, cmake, pandoc, pkg-config, zlib
-, Security, libiconv, installShellFiles
+{ lib
+, gitSupport ? true
+, stdenv
+, fetchFromGitHub
+, rustPlatform
+, cmake
+, pandoc
+, pkg-config
+, zlib
+, Security
+, libiconv
+, installShellFiles
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -26,6 +36,9 @@ rustPlatform.buildRustPackage rec {
   buildInputs = [ zlib ]
     ++ lib.optionals stdenv.isDarwin [ libiconv Security ];
 
+  buildNoDefaultFeatures = true;
+  buildFeatures = lib.optional gitSupport "git";
+
   outputs = [ "out" "man" ];
 
   postInstall = ''