Detect bootstrap version to link correct paths

The directory names for the stages are changing in version 3 of the
boostrapping (see rust-lang/rust#103286). We are
checking the version now to create the correct dummy directories.

ansible/roles/dev-desktop/files/scripts/link_rust.sh

@@ -16,12 +16,18 @@ echo 'Run "x.py build --stage 1 library/std" to create a real sysroot you can us
 EOF
 )
 
-stages=(stage1 stage2)
-
 for D in rust*; do
   if [ -d "$D" ]; then
     pushd "$D"
 
+    bootstrap_version=$(grep 'pub const VERSION' src/bootstrap/lib.rs | grep -o '[0-9]*')
+
+    if [ "$bootstrap_version" -eq 3 ]; then
+      stages=(stage1-sysroot stage2-sysroot)
+    else
+      stages=(stage1 stage2)
+    fi
+
     for stage in "${stages[@]}"; do
       directory="build/${target}/${stage}"