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/misc/system-config-printer/detect_serverbindir.patch

@@ -0,0 +1,17 @@
+diff --git a/cupshelpers/config.py.in b/cupshelpers/config.py.in
+index 55abbfc..1244327 100644
+--- a/cupshelpers/config.py.in
++++ b/cupshelpers/config.py.in
+@@ -22,3 +22,12 @@
+ prefix="@prefix@"
+ sysconfdir="@sysconfdir@"
+ cupsserverbindir="@cupsserverbindir@"
++
++try:
++    with open("/etc/cups/cups-files.conf") as config:
++        for cfgline in config:
++            args = cfgline.split(" ")
++            if len(args) == 2 and args[0] == "ServerBin":
++                cupsserverbindir = args[1].strip()
++except OSError:
++    pass