fix regression in s390x SO_PEERSEC definition

analogous to commit efda534b212f713fe2b92a62b06e45f656b763ce for
powerpc. commit 587f5a53bc3a68d80b239ba515d583df690a96df moved the
definition of SO_PEERSEC to bits/socket.h for archs where the SO_*
macros differ.
1 file changed