add a patch to fix build against postgresql 9.3

obtained from:
http://www.sraoss.jp/pipermail/pgpool-hackers/2013-April/000186.html
another patch to fix build

obtained from:
http://www.sraoss.jp/pipermail/pgpool-hackers/2013-April/000187.html
Merge pull request #320 from reallyenglish/10_1_tomoyukis

fix build