Invalid QtDeploySupport-$<CONFIG>.cmake generation

When using a CMake multi-generator (such as Xcode or Visual Studio), the generated QtDeploySupport-*.cmake files contain a reference to "QtDeployTargets-$<CONFIG>.cmake". The $<CONFIG> generator expression remains unevaluated.
 
Then an error occurs at the install stage because "QtDeployTargets-$<CONFIG>.cmake" is not found on the file system.