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/interpreters/guile/riscv.patch

@@ -0,0 +1,13 @@
+diff --git a/module/system/base/target.scm b/module/system/base/target.scm
+index 95ab8d8c9..93616f4a3 100644
+--- a/module/system/base/target.scm
++++ b/module/system/base/target.scm
+@@ -86,6 +86,8 @@
+              (endianness big))
+             ((string=? "aarch64" cpu)
+              (endianness little))
++            ((string-match "riscv[1-9][0-9]*" cpu)
++             (endianness little))
+             (else
+              (error "unknown CPU endianness" cpu)))))
+