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/applications/science/astronomy/gildas/aarch64.patch

@@ -0,0 +1,12 @@
+diff -ruN gildas-src-jul18a/admin/define-system.sh gildas-src-jul18a.aarch64/admin/define-system.sh
+--- gildas-src-jul18a/admin/define-system.sh	2018-06-12 15:22:32.000000000 +0200
++++ gildas-src-jul18a.aarch64/admin/define-system.sh	2018-07-21 13:05:52.000000000 +0200
+@@ -174,7 +174,7 @@
+     DEFAULT_CONFIG=          # Default config is empty
+     case `uname` in
+         Linux)
+-            if [ `uname -m | grep -c "x86_64"` -ne 0 ]; then
++            if [ `uname -m | grep -c "64"` -ne 0 ]; then
+         	GAG_MACHINE=x86_64
+             else
+         	GAG_MACHINE=pc