under BeOS tcp_close should use closesocket() (ITS#195)

[allen@driversoft.com]

Full_Name: Allen Reese
Version: -devel co'd 06-08-99
OS: BeOS
URL: ftp://ftp.openldap.org/incoming/allen-reese-990608.patch
Submission from: (NULL) (207.135.128.3)


under BeOS, tcp_close should call closesocket() not close().  calling close()
will cause max number of socket descriptors reached errors, because the sockets
never get closed.

the patch is to add an ifdef for BeOS in include/ac/socket.h