unittests: Use the correct defines and global variables when building on CMake.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116834 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/CMakeLists.txt b/unittests/CMakeLists.txt
index 8a5a367..d37b890 100644
--- a/unittests/CMakeLists.txt
+++ b/unittests/CMakeLists.txt
@@ -13,6 +13,8 @@
 endfunction()
 
 include_directories(${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest/include)
+set(LLVM_REQUIRES_RTTI 1)
+add_definitions(-DGTEST_HAS_RTTI=0)
 
 set(LLVM_LINK_COMPONENTS
   jit