wlroots.examples: prefix example binaries

pkgs/development/libraries/wlroots/default.nix

@@ -71,11 +71,12 @@ in stdenv.mkDerivation rec {
     # screenshot output-layout multi-pointer rotation tablet touch pointer
     # simple
     mkdir -p $examples/bin
-    for binary in $(find ./examples -executable -type f | grep -vE '\.so'); do
+    cd ./examples
+    for binary in $(find . -executable -type f -printf '%P\n' | grep -vE '\.so'); do
       patchelf \
         --set-rpath "$examples/lib:${stdenv.lib.makeLibraryPath buildInputs}" \
         "$binary"
-      cp "$binary" $examples/bin/
+      cp "$binary" "$examples/bin/wlroots-$binary"
     done
   '';