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/etebase/secret.patch

@@ -0,0 +1,26 @@
+diff --git a/etebase_server/settings.py b/etebase_server/settings.py
+index 9baf8d3..501d9f6 100644
+--- a/etebase_server/settings.py
++++ b/etebase_server/settings.py
+@@ -23,11 +22,6 @@
+ # Quick-start development settings - unsuitable for production
+ # See https://docs.djangoproject.com/en/3.0/howto/deployment/checklist/
+ 
+-# SECURITY WARNING: keep the secret key used in production secret!
+-# See secret.py for how this is generated; uses a file 'secret.txt' in the root
+-# directory
+-SECRET_FILE = os.path.join(BASE_DIR, "secret.txt")
+-
+ # SECURITY WARNING: don't run with debug turned on in production!
+ DEBUG = True
+ 
+@@ -143,7 +137,7 @@
+ 
+     section = config["global"]
+ 
+-    SECRET_FILE = section.get("secret_file", SECRET_FILE)
++    SECRET_FILE = section.get("secret_file", None)
+     STATIC_ROOT = section.get("static_root", STATIC_ROOT)
+     STATIC_URL = section.get("static_url", STATIC_URL)
+     MEDIA_ROOT = section.get("media_root", MEDIA_ROOT)
+