Add missing includes.

Test: mma
Bug: None
Change-Id: I0221b213e08d07cc5ac0b704a86e98ae8c0f456f
diff --git a/libc/bionic/bionic_arc4random.cpp b/libc/bionic/bionic_arc4random.cpp
index a339900..391eb0c 100644
--- a/libc/bionic/bionic_arc4random.cpp
+++ b/libc/bionic/bionic_arc4random.cpp
@@ -31,6 +31,7 @@
 #include <errno.h>
 #include <stdatomic.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/auxv.h>
 #include <unistd.h>