QPID-4734: Release builds fail on GCC 4.4.7 / Boost 1.41
Use pragma to turn off unavoidable unitialised variable warning under all
patchlevels of gcc 4.4

Merged from:
https://svn.apache.org/repos/asf/qpid/trunk@1466615
https://svn.apache.org/repos/asf/qpid/trunk@1469559

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.22@1469579 13f79535-47bb-0310-9956-ffa450edef68