8129607: Incorrect GPL header

Summary: fix typo in GPL header
Reviewed-by: kvn, dholmes

src/os_cpu/linux_ppc/vm/os_linux_ppc.cpp

@@ -10,7 +10,7 @@
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file hat
+ * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version