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/tools/networking/djbdns/fix-nix-usernamespace-build.patch

@@ -0,0 +1,10 @@
+--- djbdns-1.05.org/chkshsgr.c	2001-02-11 21:11:45.000000000 +0000
++++ djbdns-1.05/chkshsgr.c	2017-10-13 10:06:09.392578927 +0100
+@@ -2,6 +2,7 @@
+ 
+ int main()
+ {
++  return 0;
+   short x[4];
+ 
+   x[0] = x[1] = 0;