Only patch package content that is necessary for self-signing

Automatic patching was modifying all package files in ways that
only made sense for very limited set of projects. Some things were
also no longer necessary due other developments, so dropped
the dependency, embedded sis, and manufacturer check modifications.

Also provided an option to do a self-signed compatibility
check for the package instead of patching it automatically by
specifying "-d" parameter in QT_SIS_OPTIONS env variable
or createpackage command line, depending on how package is made.

Task-number: QTBUG-15561
Reviewed-by: axis

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