Build: remove Cycles build options to disable RTTI

This was required for OSL, which used to be compiled entirely without
RTTI for LLVM. However OSL now only compiles a private part of its code
without RTTI, so this no longer necessary.

Pull Request: https://projects.blender.org/blender/blender/pulls/116035

intern/cycles/CMakeLists.txt

@@ -191,13 +191,6 @@ if(CXX_HAS_AVX2)
   add_definitions(-DWITH_KERNEL_AVX2)
 endif()
 
-# LLVM and OSL need to build without RTTI
-if(WIN32 AND MSVC)
-  set(RTTI_DISABLE_FLAGS "/GR- -DBOOST_NO_RTTI -DBOOST_NO_TYPEID")
-elseif(CMAKE_COMPILER_IS_GNUCC OR (CMAKE_C_COMPILER_ID MATCHES "Clang"))
-  set(RTTI_DISABLE_FLAGS "-fno-rtti -DBOOST_NO_RTTI -DBOOST_NO_TYPEID")
-endif()
-
 # Definitions and Includes
 
 add_definitions(

intern/cycles/kernel/osl/CMakeLists.txt

@@ -36,9 +36,6 @@ set(LIB
   ${LLVM_LIBRARY}
 )
 
-# OSL and LLVM are built without RTTI
-string(APPEND CMAKE_CXX_FLAGS " ${RTTI_DISABLE_FLAGS}")
-
 if(APPLE)
   # Disable allocation warning on macOS prior to 10.14: the OSLRenderServices
   # contains member which is 64 bytes aligned (cache inside of OIIO's

intern/cycles/scene/CMakeLists.txt

@@ -108,8 +108,6 @@ if(WITH_CYCLES_OSL)
   list(APPEND LIB
     cycles_kernel_osl
   )
-
-  set_property(SOURCE osl.cpp PROPERTY COMPILE_FLAGS ${RTTI_DISABLE_FLAGS})
 endif()
 
 if(WITH_OPENCOLORIO)