Add missing #include for abort()

http://build.chromium.org/p/chromium.linux/builders/Android%20Arm64%20Builder%20%28dbg%29/builds/17339

Change-Id: I1cf015bb188282363aa5ddbf4e8ef88932370b62
Reviewed-on: https://boringssl-review.googlesource.com/4714
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/test/file_test.cc b/crypto/test/file_test.cc
index 12405f2..8df6f9a 100644
--- a/crypto/test/file_test.cc
+++ b/crypto/test/file_test.cc
@@ -17,6 +17,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <stdarg.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <openssl/err.h>