NetBSD ships with paccept(2), a superset of accept4(2)

Summary: accept4(2) and paccept(2) are nonstandard extensions.

Reviewers: joerg, sas

Subscribers: emaste, sas, lldb-commits

Differential Revision: http://reviews.llvm.org/D12485

Change by Kamil Rytarowski <n54@gmx.com>

llvm-svn: 246787