update_verifier: Add some missing #include's.

<stdint.h> for uint8_t; <stdlib.h> for free(3); <thread> for
std::thread.

Test: mmma -j bootable/recovery
Test: Run unit tests on crosshatch.
Change-Id: Id99b29b3d514f4e453983599c8b1aa6b0fab4ef8
diff --git a/update_verifier/update_verifier.cpp b/update_verifier/update_verifier.cpp
index 5e5eac7..ce93a46 100644
--- a/update_verifier/update_verifier.cpp
+++ b/update_verifier/update_verifier.cpp
@@ -38,17 +38,19 @@
  */
 
 #include "update_verifier/update_verifier.h"
-#include <android/os/IVold.h>
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <algorithm>
 #include <future>
+#include <thread>
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
@@ -57,6 +59,7 @@
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <android/hardware/boot/1.0/IBootControl.h>
+#include <android/os/IVold.h>
 #include <binder/BinderService.h>
 #include <binder/Status.h>
 #include <cutils/android_reboot.h>