CMake: Temporary workaround for static top-level Qt builds

Because find_package usually creates targets in a local scope,
qt_generate_prl_file fails to generate a .prl file that has
references to generator expressions like
"$<TARGET_FILE:Freetype::Freetype>" which references targets
that are not found in that specific scope (e.g Freetype target is
present in qtbase scope, but not qtsvg scope).

This happens in static top-level Qt builds, and thus fails the
configuration. While we try to figure out how to fix this adequatly,
don't generate .prl files in such a configuration.

Task-number: QTBUG-84874
Change-Id: I69cf0ad1419d21e3676e1374624601f00936c405
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

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