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/os-specific/darwin/apple-sdk/private-frameworks-setup-hook.sh

@@ -0,0 +1,8 @@
+addPrivateFrameworks() {
+    flag="-F/System/Library/PrivateFrameworks"
+    if [[ "${NIX_CFLAGS_COMPILE-}" != *$flag* ]]; then
+        NIX_CFLAGS_COMPILE+=" $flag"
+    fi
+}
+
+addEnvHooks "$hostOffset" addPrivateFrameworks