INTERFACE_POSITION_INDEPENDENT_CODE
-----------------------------------

Whether consumers need to create a position-independent target

The INTERFACE_POSITION_INDEPENDENT_CODE property informs consumers of
this target whether they must set their POSITION_INDEPENDENT_CODE
property to ON.  If this property is set to ON, then the
POSITION_INDEPENDENT_CODE property on all consumers will be set to ON.
Similarly, if this property is set to OFF, then the
POSITION_INDEPENDENT_CODE property on all consumers will be set to
OFF.  If this property is undefined, then consumers will determine
their POSITION_INDEPENDENT_CODE property by other means.  Consumers
must ensure that the targets that they link to have a consistent
requirement for their INTERFACE_POSITION_INDEPENDENT_CODE property.
