rav1e: use libgit2 from Nixpkgs

This is a native build input because it's used at build time by the
"built" crate, which tries to embed git info and build timestamps into
the binary (ugh).

This fixes cross-compilation from x86_64 to aarch64, because git2's
build.rs tries to use -m64, which is x86_64-only.

pkgs/tools/video/rav1e/default.nix

@@ -3,8 +3,11 @@
 , stdenv
 , rustPlatform
 , fetchCrate
-, nasm
+, pkg-config
 , cargo-c
+, libgit2
+, nasm
+, zlib
 , libiconv
 , Security
 }:
@@ -24,7 +27,9 @@ in rustPlatform.buildRustPackage rec {
 
   auditable = true; # TODO: remove when this is the default
 
-  nativeBuildInputs = [ nasm cargo-c ];
+  depsBuildBuild = [ pkg-config ];
+
+  nativeBuildInputs = [ cargo-c libgit2 nasm zlib ];
 
   buildInputs = lib.optionals stdenv.isDarwin [
     libiconv