Now all the cythonized modules are rewrite with a mangled name of
package + module name. This avoid symbol conflict if you have the same
module.so as another library (for example, audiostream.sources.thread
and python thread.so was in conflict).
Then, a custom builtin importer is loaded before the application start,
and when you will want to import audiostream.sources.thread, if will
import builtin audiostream_sources_thread.
kivy/ios/lxml/audiostream recipes are impacted. A full rebuild is
needed.
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