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/stdenv/linux/bootstrap-files/loongson2f.nix

@@ -0,0 +1,44 @@
+let
+
+  fetch = { file, sha256 }: import <nix/fetchurl.nix> {
+    url = "http://tarballs.nixos.org/stdenv-linux/loongson2f/r22849/${file}";
+    inherit sha256;
+    executable = true;
+  };
+
+in {
+  sh = fetch {
+    file = "sh";
+    sha256 = "02jjl49wdq85pgh61aqf78yaknn9mi3rcspbpk7hs9c4mida2rhf";
+  };
+
+  bzip2 = fetch {
+    file = "bzip2";
+    sha256 = "1qn27y3amj9c6mnjk2kyb59y0d2w4yv16z9apaxx91hyq19gf29z";
+  };
+
+  mkdir = fetch {
+    file = "mkdir";
+    sha256 = "1vbp2bv9hkyb2fwl8hjrffpywn1wrl1kc4yrwi2lirawlnc6kymh";
+  };
+
+  cpio = fetch {
+    file = "cpio";
+    sha256 = "0mqxwdx0sl7skxx6049mk35l7d0fnibqsv174284kdp4p7iixwa0";
+  };
+
+  ln = fetch {
+    file = "ln";
+    sha256 = "05lwx8qvga3yv8xhs8bjgsfygsfrcxsfck0lxw6gsdckx25fgi7s";
+  };
+
+  curl = fetch {
+    file = "curl.bz2";
+    sha256 = "0iblnz4my54gryac04i64fn3ksi9g3dx96yjq93fj39z6kx6151c";
+  };
+
+  bootstrapTools = {
+    url = "http://tarballs.nixos.org/stdenv-linux/loongson2f/r22849/cross-bootstrap-tools.cpio.bz2";
+    sha256 = "00aavbk76qjj2gdlmpaaj66r8nzl4d7pyl8cv1gigyzgpbr5vv3j";
+  };
+}