Make calls to setsockopt() for TCP keep alive depend on definition
of TCP_KEEPIDLE etc. Emit a warning if they are not defined but the
configuration file sets values.

On some platforms (FreeBSD), TCP keep alive settings are done in
the kernel via sysctl.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=slony1-engine.git;a=commitdiff;h=87eb62963ca10199b6678c086f5b890d1cf2fdb6

Modified Files
--------------
src/slon/dbutils.c |   13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)