Add malloc test support to unit tests.

Currently far from passing and I haven't even tried with a leak checker yet.
Also bn_test is slow.

Change-Id: I4fe2783aa5f7897839ca846062ae7e4a367d2469
Reviewed-on: https://boringssl-review.googlesource.com/4794
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/test/CMakeLists.txt b/crypto/test/CMakeLists.txt
index 0d5ca81..84a6174 100644
--- a/crypto/test/CMakeLists.txt
+++ b/crypto/test/CMakeLists.txt
@@ -4,4 +4,5 @@
   OBJECT
 
   file_test.cc
+  malloc.cc
 )