don't force us to use WX with any config, it should depend on an external option

Author: AnastaZIuk

CMakeLists.txt

@@ -615,11 +615,6 @@ endif( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )
 # use export_executable_symbols(target).
 set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
 
-# enable warnings as errors for debug build
-if (WIN32)
-  SET(CMAKE_CXX_FLAGS_DEBUG  "${CMAKE_CXX_FLAGS_DEBUG} /WX")
-endif (WIN32)
-
 include(AddLLVM)
 include(TableGen)