Variables starting with `o' in kern

• OBSOL kern/syscalls.master:7
• obsolete kern/syscalls.master:17
• oitv kern/kern_time.c:247
• olddelta kern/kern_time.c:132
• only kern/syscalls.master:20
• opt kern/kern_xxx.c:46
• order kern/syscalls.master:7
• osa kern/kern_sig.c:74
• oss kern/kern_sig.c:409
• osv kern/kern_sig.c:286
• other kern/syscalls.master:25