Properties which must be string-compatible with their link interface
COMPATIBLE_INTERFACE_STRING property may contain a list of
properties for this target which must be the same when evaluated as a
string in the
INTERFACE variant of the property all linked dependees.
For example, if a property
FOO appears in the list, then for each
INTERFACE_FOO property content in all of its
dependencies must be equal with each other, and with the
in the depender. If the property is not set, then it is ignored.
Note that for each dependee, the set of properties specified in this property must not intersect with the set specified in any of the other Compatible Interface Properties.