Defines starting with `o' in previous

• OPT_DISK0_SIZE ./dynamips.h:62
• OPT_DISK1_SIZE ./dynamips.h:63
• OPT_EXEC_AREA ./dynamips.h:64
• OPT_IDLE_PC ./dynamips.h:65
• OPT_IOMEM_SIZE ./dynamips.h:68
• OPT_SPARSE_MEM ./dynamips.h:69
• OPT_TIMER_ITV ./dynamips.h:66
• OPT_VM_DEBUG ./dynamips.h:67