uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/servers/sql/postgresql/ext/pg_rational.nix

@@ -0,0 +1,39 @@
+{ stdenv
+, fetchFromGitHub
+, lib
+, postgresql
+}:
+
+stdenv.mkDerivation rec {
+  pname = "pg_rational";
+  version = "0.0.2";
+
+  src = fetchFromGitHub {
+    owner  = "begriffs";
+    repo   = "pg_rational";
+    rev    = "v${version}";
+    sha256 = "sha256-Sp5wuX2nP3KGyWw7MFa11rI1CPIKIWBt8nvBSsASIEw=";
+  };
+
+  buildInputs = [ postgresql ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/{lib,share/postgresql/extension}
+
+    cp *.so      $out/lib
+    cp *.sql     $out/share/postgresql/extension
+    cp *.control $out/share/postgresql/extension
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Precise fractional arithmetic for PostgreSQL";
+    homepage    = "https://github.com/begriffs/pg_rational";
+    maintainers = with maintainers; [ netcrns ];
+    platforms   = postgresql.meta.platforms;
+    license     = licenses.mit;
+  };
+}