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/libraries/webrtc-audio-processing/enable-riscv.patch

@@ -0,0 +1,18 @@
+diff --git a/webrtc/typedefs.h b/webrtc/typedefs.h
+index d875490..ce1f3e8 100644
+--- a/webrtc/typedefs.h
++++ b/webrtc/typedefs.h
+@@ -26,6 +26,13 @@
+ #elif defined(__aarch64__)
+ #define WEBRTC_ARCH_64_BITS
+ #define WEBRTC_ARCH_LITTLE_ENDIAN
++#elif defined(__riscv) || defined(__riscv__)
++#define WEBRTC_ARCH_LITTLE_ENDIAN
++#if __riscv_xlen == 64
++#define WEBRTC_ARCH_64_BITS
++#else
++#define WEBRTC_ARCH_32_BITS
++#endif
+ #elif defined(_M_IX86) || defined(__i386__)
+ #define WEBRTC_ARCH_X86_FAMILY
+ #define WEBRTC_ARCH_X86