USE_PTHREAD_SERIALIZED_ACCEPT results in locking problems when the

child that has the current lock gets killed by the parent.  Restore
USE_FCNTL_SERIALIZED_ACCEPT as the default for Solaris2, at least
until we get one of the other locking mechanisms to work reliably.

Reviewed by:	Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79516 13f79535-47bb-0310-9956-ffa450edef68