tests/ip_mreq: skip if basic setsockopt operations fail
tests/ip_mreq: skip if basic setsockopt operations fail

* tests/ip_mreq.c (main): Return 77 if basic
IP_ADD_MEMBERSHIP/IP_DROP_MEMBERSHIP options cannot be set.

Saruta/strace,vrastogi/strace,Saruta/strace,cuviper/strace,vrastogi/strace,MonkeyZZZZ/platform_external_strace,Distrotech/strace,Distrotech/strace,kapdop/android_external_strace,vrastogi/strace,Distrotech/strace,MonkeyZZZZ/platform_external_strace,Saruta/strace,kapdop/android_external_strace,MonkeyZZZZ/platform_external_strace,kapdop/android_external_strace,Saruta/strace,Saruta/strace,MonkeyZZZZ/platform_external_strace,cuviper/strace,kapdop/android_external_strace,cuviper/strace,kapdop/android_external_strace,Distrotech/strace,vrastogi/strace,vrastogi/strace,cuviper/strace,cuviper/strace,MonkeyZZZZ/platform_external_strace,Distrotech/strace