Autogen: Visual Studio builds broken in 3.9.0-rc1

The Qt5Autogen test fails with Visual Studio generators:

110: CMake Error in C:/.../Tests/QtAutogen/rccDepends/CMakeLists.txt:
110:   Target "rccDepends" has source files which vary by configuration.  This is
110:   not supported by the "Visual Studio 15 2017" generator.
110:
110:   Config "Debug":
110:
110:     C:/.../Tests/QtAutogen/rccDepends/main.cpp
110:     C:/.../Tests/Qt5Autogen/rccDepends/res1.qrc
110:     C:/.../Tests/Qt5Autogen/rccDepends/res2.qrc
110:     C:/.../Tests/Qt5Autogen/rccDepends/rccDepends_autogen/EJRQKI7XPS/qrc_res1_Debug.cpp
110:     C:/.../Tests/Qt5Autogen/rccDepends/rccDepends_autogen/EJRQKI7XPS/qrc_res2_Debug.cpp
110:
110:   Config "Release":
110:
110:     C:/.../Tests/QtAutogen/rccDepends/main.cpp
110:     C:/.../Tests/Qt5Autogen/rccDepends/res1.qrc
110:     C:/.../Tests/Qt5Autogen/rccDepends/res2.qrc
110:     C:/.../Tests/Qt5Autogen/rccDepends/rccDepends_autogen/EJRQKI7XPS/qrc_res1_Release.cpp
110:     C:/.../Tests/Qt5Autogen/rccDepends/rccDepends_autogen/EJRQKI7XPS/qrc_res2_Release.cpp
...
110: CMake Error at C:/.../Tests/QtAutogen/rccDepends/CMakeLists.txt:29 (add_executable):
110:   Cannot find source file:
110:
110:     C:/.../Tests/Qt5Autogen/rccDepends/rccDepends_autogen/EJRQKI7XPS/qrc_res1_.cpp
110:
110:   Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
110:   .hxx .in .txx
110:

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