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/nim-packages/fetch-nimble/builder.sh

@@ -0,0 +1,12 @@
+source $stdenv/setup
+export HOME=$NIX_BUILD_TOP
+
+nimble --accept --noSSLCheck develop "${pkgname}@${version}"
+# TODO: bring in the certificates for Nimble to verify the fetch of
+# the package list.
+
+pkgdir=${NIX_BUILD_TOP}/${pkgname}
+
+find "$pkgdir" -name .git -print0 | xargs -0 rm -rf
+
+cp -a "$pkgdir" "$out"