Fix malfunction of socket functions on HP-UX in 64-bit mode. * m4/socketlib.m4 (gl_SOCKETLIB): Add comment. * m4/extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Define _HPUX_ALT_XOPEN_SOCKET_API. * modules/accept (Depends-on): Add 'extensions'. * modules/getpeername (Depends-on): Likewise. * modules/getsockname (Depends-on): Likewise. * modules/getsockopt (Depends-on): Likewise. * modules/recvfrom (Depends-on): Likewise. * doc/posix-functions/accept.texi: Mention the HP-UX socklen_t problem. * doc/posix-functions/getpeername.texi: Likewise. * doc/posix-functions/getsockname.texi: Likewise. * doc/posix-functions/getsockopt.texi: Likewise. * doc/posix-functions/recvfrom.texi: Likewise.

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testdir*