net.c: use SO_LINGER unconditionally
net.c: use SO_LINGER unconditionally

* net.c (print_linger, print_getsockopt, print_setsockopt): Do not check
for SO_LINGER availability.

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