Remove no-longer-used macro.

None of our libcs require this macro any more.

Change-Id: I0aa232d6cef67c7ce108b579d7d54bc42d7743e7
diff --git a/libril/RilSapSocket.cpp b/libril/RilSapSocket.cpp
index 211371e..3b06b3c 100644
--- a/libril/RilSapSocket.cpp
+++ b/libril/RilSapSocket.cpp
@@ -14,7 +14,6 @@
 * limitations under the License.
 */
 
-#define __STDC_LIMIT_MACROS
 #include <stdint.h>
 #define RIL_SHLIB
 #include "telephony/ril.h"