Variables starting with `o' in kern

• OBSOL kern/syscalls.master:8
• obsolete kern/syscalls.master:18
• oitv kern/kern_time.c:227
• olddelta kern/kern_time.c:123
• only kern/syscalls.master:22
• opt kern/kern_xxx.c:176
• order kern/syscalls.master:8
• osa kern/kern_sig.c:77
• oss kern/kern_sig.c:396
• osv kern/kern_sig.c:281
• other kern/syscalls.master:27