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/applications/misc/polybar/remove-hardcoded-etc.diff

@@ -0,0 +1,13 @@
+diff --git a/src/utils/file.cpp b/src/utils/file.cpp
+index 9511ad61..d3d82b99 100644
+--- a/src/utils/file.cpp
++++ b/src/utils/file.cpp
+@@ -322,7 +322,7 @@ namespace file_util {
+       possible_paths.push_back(xdg_config_dir + suffix + ".ini");
+     }
+ 
+-    possible_paths.push_back("/etc" + suffix + ".ini");
++    possible_paths.push_back("@out@" + suffix + ".ini");
+ 
+     for (const string& p : possible_paths) {
+       if (exists(p)) {