QPID-5028: Qmf2 examples install script error
Don't try to install files that don't exist.
This patch may be superseded by new CMake files or by the addition of the .sln and .vcproj that are currently missing.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1508967 13f79535-47bb-0310-9956-ffa450edef68