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/maildrop/maildrop.configure.hack.patch

@@ -0,0 +1,13 @@
+--- a/maildrop/configure	2012-09-06 01:52:13.000000000 +0100
++++ b/maildrop/configure	2013-01-04 03:00:57.095628327 +0000
+@@ -17562,8 +17562,8 @@
+ check_spooldir() {
+   if test "$CHECKED_SPOOLDIR" != 1
+   then
+-     get_spooldir
+-     MBOX_DIR="$SPOOLDIR"
++     MBOX_DIR="/var/spool/mail"
++     MBOX_RESET_GID=0
+      CHECKED_SPOOLDIR=1
+   fi
+ }