Fix Bug#58279 Incorrect enabling of UNIV_DEBUG in debug builds

Checking "IF(WITH_DEBUG)" does not work for multi-configuration CMake
generators like VS or XCode. See
http://forge.mysql.com/wiki/CMake#Debug-only_options

storage/innobase/CMakeLists.txt

@@ -40,10 +40,9 @@ IF(UNIX)
   ENDIF()
 ENDIF()
 
-# Enable InnoDB's UNIV_DEBUG if MySQL's WITH_DEBUG is defined
-IF(WITH_DEBUG)
-  ADD_DEFINITIONS("-DUNIV_DEBUG")
-ENDIF()
+# Enable InnoDB's UNIV_DEBUG for debug builds
+SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DUNIV_DEBUG")
+SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DUNIV_DEBUG")
 
 IF(NOT MSVC)
 # either define HAVE_IB_GCC_ATOMIC_BUILTINS or not