Don't build with OPENSSL_SMALL.

This was submitted to check that it worked on all the builders but, in
normal usage, we should build without OPENSSL_SMALL so that everything
is compiled.

Change-Id: I31ac899862e3b31c55bf265a7ec5ff0cc9770b48
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69bc3b1..5b5c088 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,7 +81,6 @@
 endif()
 
 add_definitions(-DBORINGSSL_IMPLEMENTATION)
-add_definitions(-DOPENSSL_SMALL)
 
 if (BUILD_SHARED_LIBS)
   add_definitions(-DBORINGSSL_SHARED_LIBRARY)