Document reading LOCATION early as undefined (#11671)

Reading the LOCATION target property currently locks down the result and
ignores any later changes to properties that affect it.  This may or may
not be expected and may or may not be the behavior in earlier versions
of CMake.  The property is documented as provided only for compatibility
with CMake 2.4 and alternative interfaces are now available for all
originally envisioned use cases.  We want to discourage its use without
outright deprecating it.  Add documentation to explicitly state that
reading the property before other properties are set is undefined.

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