Compare prerelease versions correctly for updates

tests/release_scripts.rs

@@ -44,6 +44,8 @@ fn installers_skip_stale_latest_release_prebuilts() {
     assert!(install.contains("latest_release_is_stale"));
     assert!(install.contains("current_source_version"));
     assert!(install.contains("latest release $latest is older than source $current"));
+    assert!(install.contains("version_prerelease"));
+    assert!(install.contains("prerelease_less_than"));
     assert!(
         install.contains("if latest_release_is_stale; then"),
         "unix installer must skip stale latest before downloading a prebuilt"
@@ -53,6 +55,8 @@ fn installers_skip_stale_latest_release_prebuilts() {
     assert!(ps1.contains("Latest-ReleaseIsStale"));
     assert!(ps1.contains("Current-SourceVersion"));
     assert!(ps1.contains("latest release $latestVersion is older than source $current"));
+    assert!(ps1.contains("Version-Prerelease"));
+    assert!(ps1.contains("Compare-Prerelease"));
     assert!(
         ps1.contains("if (Latest-ReleaseIsStale)"),
         "windows installer must skip stale latest before downloading a prebuilt"