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/repmgr.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, fetchFromGitHub
+, postgresql
+, openssl
+, zlib
+, readline
+, flex
+}:
+
+stdenv.mkDerivation rec {
+  pname = "repmgr";
+  version = "5.3.1";
+
+  src = fetchFromGitHub {
+    owner = "2ndQuadrant";
+    repo = "repmgr";
+    rev = "v${version}";
+    sha256 = "sha256-fHoXbFOF3xj/eNHgQIghF15vbDObnuwl2DAH+zRVGZQ=";
+  };
+
+  nativeBuildInputs = [ flex ];
+
+  buildInputs = [ postgresql openssl zlib readline ];
+
+  installPhase = ''
+    mkdir -p $out/{bin,lib,share/postgresql/extension}
+
+    cp repmgr{,d} $out/bin
+    cp *.so       $out/lib
+    cp *.sql      $out/share/postgresql/extension
+    cp *.control  $out/share/postgresql/extension
+  '';
+
+  meta = with lib; {
+    homepage = "https://repmgr.org/";
+    description = "Replication manager for PostgreSQL cluster";
+    license = licenses.postgresql;
+    platforms = postgresql.meta.platforms;
+    maintainers = with maintainers; [ zimbatm ];
+  };
+}