Convert IOException to Ruby exception correctly

Many libraries depend on us raising the actual Errno exceptions
for what comes out of Java as IOException. The utilities in JRuby
exist to convert these IOException objects into the appropriate
Errno exception by examining the exception type and message. This
patch switches one key place for #242 to use this utility method.

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

@@ -951,7 +951,7 @@ private IRubyObject syswriteImpl(final ThreadContext context,
         }
         catch (IOException ex) {
             debugStackTrace(runtime, "SSLSocket.syswriteImpl", ex);
-            throw Utils.newError(runtime, runtime.getIOError(), ex);
+            throw runtime.newIOErrorFromException(ex);
         }
     }