xtensa-config.c: missing defs.h include.

All .c files must start by including defs.h.

2014-01-22  Pedro Alves  <palves@redhat.com>

	* xtensa-config.c: Include defs.h.

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2014-01-22  Pedro Alves  <palves@redhat.com>
+
+	* xtensa-config.c: Include defs.h.
+
 2014-01-22  Joel Brobecker  <brobecker@adacore.com>
 
 	* common/common-utils.h: Add "ARI:" comment beside __func__

gdb/xtensa-config.c

@@ -17,6 +17,8 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
+#include "defs.h"
+
 #define XTENSA_CONFIG_VERSION 0x60
 
 #include "xtensa-config.h"