Add a * to the revision in RUBY_DESCRIPTION etc when the Git repo is dirty

Author: chrisseaton

src/shared/java/org/truffleruby/shared/TruffleRuby.java

@@ -49,14 +49,21 @@ public static String getEngineVersion() {
         // The property cannot be read in a static initializer, it's set later
         final String systemVersion = System.getProperty("org.graalvm.version");
 
+        final String revisionString;
+        if (BuildInformationImpl.INSTANCE.isDirty()) {
+            revisionString = BuildInformationImpl.INSTANCE.getShortRevision() + "*";
+        } else {
+            revisionString = BuildInformationImpl.INSTANCE.getShortRevision();
+        }
+
         // No version information, or just "dev" - use 0.0-commit
         if (systemVersion == null || systemVersion.equals("dev")) {
-            return "0.0-" + BuildInformationImpl.INSTANCE.getShortRevision();
+            return "0.0-" + revisionString;
         }
 
         // A "-dev" version number - append the commit as well
         if (systemVersion.endsWith("-dev")) {
-            return systemVersion + "-" + BuildInformationImpl.INSTANCE.getShortRevision();
+            return systemVersion + "-" + revisionString;
         }
 
         return systemVersion;