CMP0022: Teach plain tll to populate INTERFACE_LINK_LIBRARIES
target_link_libraries: Revert accidental change

In commit c4373b33 (cmTarget: Make GetProperty() const, 2013-10-29)
we accidentally changed the cmTargetLinkLibrariesCommand.cxx logic
in a way that looks like a local experiment leftover that went
unnoticed due to the size of the other changes in the commit.
Revert it.
Merge topic 'revert-accidental-tll-change' into next

4064d6f target_link_libraries: Revert accidental change
Merge topic 'handle-only-plain-tll' into next

e600027 CMP0022: Teach plain tll to populate INTERFACE_LINK_LIBRARIES