is not needed any more with current versions of FreeBSD.
(Entries 52410 and 52412 in the Bug DB)

That change is based on Dan Nelson replying on the
FreeBSD mailing list, freebsd-questions@freebsd.org
in a thread running from 2010-Apr-29 to 2010-May-1 titled
     "Need info about FreeBSD and interrupted system
      calls for MySQL code"

Also, ensure the cmake settings correspond to the autotools
ones: Add "HAVE_BROKEN_REALPATH" to cmake.


cmake/os/FreeBSD.cmake:
  With current versions of FreeBSD, threading is not done on
  the user-level any more, so the huge "net retry count"
  is not needed any more.
  However, it is still being kept as a comment for now,
  so that it can be re-activated should the need arise.
  
  In addition, set "HAVE_BROKEN_REALPATH" to completely
  mirror the autotools path.
configure.in:
  With current versions of FreeBSD, threading is not done on
  the user-level any more, so the huge "net retry count"
  is not needed any more.
  This definitely holds for FreeBSD version 6 and up.
  
  Adapt the informational messages to the path taken.