(porting) KEEP_POINTER_ALIVE added into classloader.c in 1.1.x for OpenVMS pltfm

For the JDK 116 release on the OpenVMS platform running on DIGITAL's
hardware, DIGITAL has changed, the following JDK 116 source file
in the shared part of the JDK.

KEEP_POINTER_ALIVE added into classloader.c in 1.1.6 for OpenVMS platform.

diff -c -r JDK116/src/share/java/runtime/classloader.c
sun_JDK116/src/share/java/runtime/classloader.c
*** JDK116/src/share/java/runtime/classloader.c Thu Apr 30 03:56:41 1998
--- sun_JDK116/src/share/java/runtime/classloader.c Thu Apr 16 13:49:56 1998***************
*** 711,717 ****
            getNbytes(context, length, NULL);
        }
      }
- KEEP_POINTER_ALIVE(ucb); /*** HDS ***/
  }

  /* Create a fake array class that has the specified fields */
--- 708,713 ----
***************
*** 761,767 ****
        ucb->access = ACC_FINAL | ACC_ABSTRACT | ACC_PUBLIC;
      }
      AddBinClass(cb);
- KEEP_POINTER_ALIVE(ucb); /*** HDS ***/
      return cb;
  }

--- 757,762 ----