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/compilers/nim/NIM_CONFIG_DIR.patch

@@ -0,0 +1,23 @@
+diff --git a/compiler/nimconf.nim b/compiler/nimconf.nim
+index a470179bd..73cfa1a23 100644
+--- a/compiler/nimconf.nim
++++ b/compiler/nimconf.nim
+@@ -225,10 +225,15 @@ proc getUserConfigPath*(filename: RelativeFile): AbsoluteFile =
+ proc getSystemConfigPath*(conf: ConfigRef; filename: RelativeFile): AbsoluteFile =
+   # try standard configuration file (installation did not distribute files
+   # the UNIX way)
+-  let p = getPrefixDir(conf)
+-  result = p / RelativeDir"config" / filename
++  let
++    prefix = getPrefixDir(conf)
++    env = getEnv("NIM_CONFIG_PATH")
++  if env != "":
++    result = env.toAbsoluteDir / filename
++  else:
++    result = prefix / RelativeDir"config" / filename
+   when defined(unix):
+-    if not fileExists(result): result = p / RelativeDir"etc/nim" / filename
++    if not fileExists(result): result = prefix / RelativeDir"etc/nim" / filename
+     if not fileExists(result): result = AbsoluteDir"/etc/nim" / filename
+
+ proc loadConfigs*(cfg: RelativeFile; cache: IdentCache; conf: ConfigRef) =