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/dotnet/dotnetbuildhelpers/patch-fsharp-targets.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Some project files look for F# targets in $(FSharpTargetsPath)
+# so it's a good idea to add something like this to your ~/.bash_profile:
+
+# export FSharpTargetsPath=$(dirname $(which fsharpc))/../lib/mono/4.0/Microsoft.FSharp.Targets
+
+# In build scripts, you would add somehting like this:
+
+# export FSharpTargetsPath="${fsharp}/lib/mono/4.0/Microsoft.FSharp.Targets"
+
+# However, some project files look for F# targets in the main Mono directory. When that happens
+# patch the project files using this script so they will look in $(FSharpTargetsPath) instead.
+
+echo "Patching F# targets in fsproj files..."
+
+find -iname \*.fsproj -print -exec \
+  sed --in-place=.bak \
+    -e 's,<FSharpTargetsPath>\([^<]*\)</FSharpTargetsPath>,<FSharpTargetsPath Condition="Exists('\'\\1\'')">\1</FSharpTargetsPath>,'g \
+    {} \;