Add missing includes.

Test: mma
Bug: None
Change-Id: I0221b213e08d07cc5ac0b704a86e98ae8c0f456f
diff --git a/libc/bionic/android_set_abort_message.cpp b/libc/bionic/android_set_abort_message.cpp
index 2a11613..8c80c5a 100644
--- a/libc/bionic/android_set_abort_message.cpp
+++ b/libc/bionic/android_set_abort_message.cpp
@@ -29,6 +29,7 @@
 #include <android/set_abort_message.h>
 
 #include <pthread.h>
+#include <string.h>
 #include <sys/mman.h>
 
 #include "private/ScopedPthreadMutexLocker.h"