we (still) should not break older JRubies we test against on CI (in 0.9.x)

Author: kares

src/main/java/org/jruby/ext/openssl/Random.java

@@ -68,6 +68,9 @@ private static Holder createHolderImpl() {
         if (HOLDER_TYPE.equals("strong")) {
             return new StrongHolder();
         }
+        if (ThreadLocalHolder.secureRandomField == null) {
+            return new SharedHolder(); // fall-back on (older) JRuby <= 1.7.4
+        }
         return new ThreadLocalHolder();
     }