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/tools/analysis/sparse/tests.nix

@@ -0,0 +1,24 @@
+{ runCommand, gcc, sparse, writeText }:
+let
+  src = writeText "CODE.c" ''
+    #include <stdio.h>
+    #include <stddef.h>
+    #include <stdlib.h>
+
+    int main(int argc, char *argv[]) {
+      return EXIT_SUCCESS;
+    }
+  '';
+in
+  runCommand "${sparse.pname}-tests" { buildInputs = [ gcc sparse ]; meta.timeout = 3; }
+''
+  set -eu
+  ${sparse}/bin/cgcc ${src} > output 2>&1 || ret=$?
+  if [[ -z $(<output) ]]; then
+    mv output $out
+  else
+    echo "Test build returned $ret"
+    cat output
+    exit 1
+  fi
+''