defs.h: remove unused prototype
defs.h: remove unused prototype

* defs.h (print_sock_optmgmt): Remove.

Saruta/strace,cuviper/strace,cuviper/strace,cuviper/strace,cuviper/strace,Saruta/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace