Defines starting with `u' in osfmk/mach

• UNBND osfmk/mach/rpc.h:128
• UPL_ABORT_ERROR osfmk/mach/memory_object_types.h:265
• UPL_ABORT_FREE_ON_EMPTY osfmk/mach/memory_object_types.h:266
• UPL_ABORT_RESTART osfmk/mach/memory_object_types.h:263
• UPL_ABORT_UNAVAILABLE osfmk/mach/memory_object_types.h:264
• UPL_CHECK_DIRTY osfmk/mach/memory_object_types.h:269
• UPL_CLEAN_IN_PLACE osfmk/mach/memory_object_types.h:257
• UPL_COPYOUT_FROM osfmk/mach/memory_object_types.h:254
• UPL_NOBLOCK osfmk/mach/memory_object_types.h:258
• UPL_NO_SYNC osfmk/mach/memory_object_types.h:256
• UPL_PRECIOUS osfmk/mach/memory_object_types.h:255
• UPL_RET_ONLY_DIRTY osfmk/mach/memory_object_types.h:259
• UPL_SET_INTERNAL osfmk/mach/memory_object_types.h:260
• USEC_PER_SEC osfmk/mach/clock_types.h:78
• USER_EVENT osfmk/mach/etap.h:190