Autogen: Add (CMAKE_)AUTOGEN_ORIGIN_DEPENDS
This adds
- the variable
CMAKE_AUTOGEN_ORIGIN_DEPENDS
which initializes - the target property
AUTOGEN_ORIGIN_DEPENDS
which controls whether the origin target dependencies should
be forwarded to the corresponding _autogen
target or not.
The default value of CMAKE_AUTOGEN_ORIGIN_DEPENDS
is ON
which corresponds to the behavior
that is in place since CMake 3.9.