Code cleanup: fix various compiler warnings on clang/macOS.

source/blender/draw/engines/eevee/eevee_bloom.c

source/blender/draw/engines/eevee/eevee_screen_raytrace.c

source/blender/draw/engines/eevee/eevee_subsurface.c

source/blender/gpu/intern/gpu_batch_presets.c

source/blender/windowmanager/intern/wm_operators.c

...blender/windowmanager/message_bus/intern/wm_message_bus.c

...der/windowmanager/message_bus/intern/wm_message_bus_rna.c