CMake: Don't try to add 3rd party includes to ModuleDepends files

When creating the include/QtShaderTools/QtShaderToolsDepends file
in QtPostProcess.cmake -> qt_internal_write_depends_file(),
we decide which include files to append based on link dependencies
starting with Qt::, which happens to match 3rd party targets like
Qt::BundledSpirv_Cross which doesn't expose headers in the
prefix/include dir.

Mark all bundled targets with the QT_MODULE_SKIP_DEPENDS_INCLUDE
property to exclude them from being added to Depends files.

This should fix static builds of qtquick3d which includes
<QtShaderTools/QtShaderToolsDepend> which tries to include a
non-existent <QtBundledSpirv_Cross/QtBundledSpirv_Cross>.

Change-Id: I9dcff1e2ab721a7c21fcff3fda0faf8d023d60ba
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

cmake/QtBuild.cmake

@@ -3104,6 +3104,7 @@ function(qt_add_3rdparty_library target)
             VERSION ${PROJECT_VERSION}
             SOVERSION ${PROJECT_VERSION_MAJOR}
             QT_MODULE_IS_3RDPARTY_LIBRARY TRUE
+            QT_MODULE_SKIP_DEPENDS_INCLUDE TRUE
         )
         qt_handle_multi_config_output_dirs("${target}")