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/calibre-web/db-migrations.patch

@@ -0,0 +1,14 @@
+diff --git a/cps/__init__.py b/cps/__init__.py
+index 627cca0b..233bb2dd 100644
+--- a/cps/__init__.py
++++ b/cps/__init__.py
+@@ -87,6 +87,9 @@ db.CalibreDB.setup_db(config, cli.settingspath)
+ 
+ calibre_db = db.CalibreDB()
+ 
++if os.environ.get('__RUN_MIGRATIONS_AND_EXIT'):
++    sys.exit(0)
++
+ def create_app():
+     app.wsgi_app = ReverseProxied(app.wsgi_app)
+     # For python2 convert path to unicode