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/nim-packages/spry/nil.patch

@@ -0,0 +1,35 @@
+diff --git a/src/ispry.nim b/src/ispry.nim
+index 23ad6c3..dc38a9d 100644
+--- a/src/ispry.nim
++++ b/src/ispry.nim
+@@ -134,8 +134,8 @@ proc main() =
+       #discard spry.setBinding(newEvalWord("@"), result)
+       var output = $result
+       # Print any result
+-      if output.isNil:
+-        output = if suspended: "nil" else: ""
++      if output == "" and suspended:
++        output = "nil"
+       stdout.write(output & "\n")
+ #      except:
+  #       echo "Oops, sorry about that: " & getCurrentExceptionMsg() & "\n"
+diff --git a/src/spry.nim b/src/spry.nim
+index 670a280..d81bb4c 100644
+--- a/src/spry.nim
++++ b/src/spry.nim
+@@ -87,13 +87,13 @@ for kind, key, val in getopt():
+   of cmdEnd: assert(false) # cannot happen
+ 
+ if eval:
+-  if filename == nil:
++  if filename == "":
+     writeHelp()
+   else:
+     code = filename
+ else:
+   code =
+-    if filename == nil:
++    if filename == "":
+       # no filename has been given, so we use stdin
+       readAll stdin
+     else: