QPID-5436 - Cherrypicked fix from trunk.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/branches/0.1@1553139 13f79535-47bb-0310-9956-ffa450edef68
QPID-5436 - Removed a spurious message line.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/branches/0.1@1553140 13f79535-47bb-0310-9956-ffa450edef68
QPID-5448 - Cherry-picked this fix to the 0.1 release branch.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/branches/0.1@1555125 13f79535-47bb-0310-9956-ffa450edef68
NO-JIRA: SysVInit script for qpid-dxrouterd.
QPID-5517: Don't discard CFLAGS when building.