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/build-support/fetchgit/builder.sh

@@ -0,0 +1,18 @@
+# tested so far with:
+# - no revision specified and remote has a HEAD which is used
+# - revision specified and remote has a HEAD
+# - revision specified and remote without HEAD
+source $stdenv/setup
+
+header "exporting $url (rev $rev) into $out"
+
+$SHELL $fetcher --builder --url "$url" --out "$out" --rev "$rev" \
+  ${leaveDotGit:+--leave-dotGit} \
+  ${fetchLFS:+--fetch-lfs} \
+  ${deepClone:+--deepClone} \
+  ${fetchSubmodules:+--fetch-submodules} \
+  ${sparseCheckout:+--sparse-checkout "$sparseCheckout"} \
+  ${branchName:+--branch-name "$branchName"}
+
+runHook postFetch
+stopNest