Delete operator= and copy constructor for Scoped*

Change-Id: I3e3eb16d58c94926c68991c3a5a4abe67d5bb6f2
Reviewed-on: https://boringssl-review.googlesource.com/11360
Commit-Queue: Matt Braithwaite <mab@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/include/openssl/base.h b/include/openssl/base.h
index 584b920..2d3df7b 100644
--- a/include/openssl/base.h
+++ b/include/openssl/base.h
@@ -361,6 +361,9 @@
   StackAllocated() { init(&ctx_); }
   ~StackAllocated() { cleanup(&ctx_); }
 
+  StackAllocated(const StackAllocated<T, CleanupRet, init, cleanup> &) = delete;
+  T& operator=(const StackAllocated<T, CleanupRet, init, cleanup> &) = delete;
+
   T *get() { return &ctx_; }
   const T *get() const { return &ctx_; }