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/development/libraries/bashup-events/4.4.nix

@@ -0,0 +1,20 @@
+{ callPackage, fetchFromGitHub }:
+
+callPackage ./generic.nix {
+  variant = "4.4";
+  version = "2020-04-04";
+  branch = "bash44";
+  src = fetchFromGitHub {
+    owner = "bashup";
+    repo = "events";
+    rev = "e97654f5602fc4e31083b27afa18dcc89b3e8296";
+    hash = "sha256-51OSIod3mEg3MKs4rrMgRcOimDGC+3UIr4Bl/cTRyGM=";
+  };
+  keep = {
+    # allow vars in eval
+    eval = [ "e" "bashup_ev" "n" ];
+    # allow vars executed as commands
+    "$f" = true;
+    "$n" = true;
+  };
+}