Add recipe for relibc tests, patch userutils

recipes/relibc-tests/recipe.sh

@@ -0,0 +1,13 @@
+GIT=https://gitlab.redox-os.org/redox-os/relibc.git
+
+function recipe_build {
+    make CARGO=xargo NATIVE_RELIBC=1 -C tests -j"$(nproc)"
+    skip=1
+}
+
+function recipe_stage {
+    dest="$(realpath $1)"
+    mkdir -pv "$dest/share/relibc"
+    cp -rv "tests" "$dest/share/relibc/tests"
+    skip=1
+}

recipes/userutils/recipe.sh

@@ -1,4 +1,5 @@
 GIT=https://gitlab.redox-os.org/redox-os/userutils.git
+BRANCH=redox-unix
 BINS=(
     id
     getty