Fix compile errors/warnings when compiling against pg 9.2

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=slony1-engine.git;a=commitdiff;h=387b9d19ae0147fcedd03ce4c9587ff89bf8d37e

Modified Files
--------------
src/backend/slony1_funcs.c |    5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)