#i114728# force target compatibility when building with a newer OSX SDK

using OSX's MAC_OS_X_VERSION_MAX_ALLOWED define forces the build to be binary
compatibile to the configured deployment target, even when the SDK version
employed for building it is newer than the deployment target


git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1568287 13f79535-47bb-0310-9956-ffa450edef68