Always try to find dependencies for plugins

Generated plugin CMake files should always try to call
find_dependency, especially in static builds.

pkg_check_modules sets a cache value for foo_FOUND instead of
a directory scope foo_FOUND, which means that find_dependency
will not be called in another scope, and thus fail to create
needed imported targets.

Note this makes the code be the same as in
ModuleDependencies.cmake.in.

Change-Id: I0b58b038afcb72cb27d0b433371bc9cb5e4bfec9
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

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