Fix: Cycles standalone build failures

Pull Request: https://projects.blender.org/blender/blender/pulls/122718

CMakeLists.txt

@@ -2585,6 +2585,7 @@ if(WITH_BLENDER)
   # internal and external library information first, for test linking
   add_subdirectory(source)
 elseif(WITH_CYCLES_STANDALONE OR WITH_CYCLES_HYDRA_RENDER_DELEGATE)
+  add_subdirectory(intern/atomic)
   add_subdirectory(intern/guardedalloc)
   add_subdirectory(intern/libc_compat)
   add_subdirectory(intern/sky)

intern/cycles/app/opengl/shader.cpp

@@ -51,7 +51,7 @@ static void shader_print_errors(const char *task, const char *log, const char *c
   LOG(ERROR) << "Shader: " << task << " error:";
   LOG(ERROR) << "===== shader string ====";
 
-  stringstream stream(code);
+  std::stringstream stream(code);
   string partial;
 
   int line = 1;