Fix build with CMake 3.8.
Before CMake 3.8, automoc'ed files were saved in the build directory. With CMake 3.8, they're now saved into $targetName_autogen/include and exported to $targetName's INCLUDE_DIRECTORIES variable. mailserializertest.cpp #includes akonadi_serializer_mail.cpp which #includes moc_akonadi_serializer_mail.cpp. As a result, CMake had no way to guess where where the automoc'ed file is.
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