Temporarily disabled VS2010 warning 4512.

Change-Id: Ib75b4cc651ac8f67cd262c8293fca1ac590f6b71
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3670afe..8ef5085 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -138,6 +138,9 @@
   set(CMAKE_CXX_FLAGS
     "${CMAKE_CXX_FLAGS} -fsigned-char")
 
+elseif(MSVC)
+  # warning C4512: assignment operator could not be generated
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4512")
 endif()
 
 if(FLATBUFFERS_CODE_COVERAGE)