Defines starting with `o' in previous

• O_BINARY src/cpu/sysdeps.h:325
• O_CREAT src/cpu/sysdeps.h:329
• O_NDELAY src/cpu/sysdeps.h:289
• open src/cpu/sysdeps.h:384
• opendir src/cpu/sysdeps.h:369
• OPENGL src/cpu/sysconfig.h:39
• OPTIMIZED_FLAGS src/cpu/sysconfig.h:19
• OPTIONS_CPU_H src/cpu/options_cpu.h:9
• O_RDONLY src/cpu/sysdeps.h:327
• O_RDWR src/cpu/sysdeps.h:328
• OSTACK_MAX src/debug/evaluate.c:50
• O_TRUNC src/cpu/sysdeps.h:330
• O_WRONLY src/cpu/sysdeps.h:326