pyplugins: alter unloading behavior wrt __main_loop_wait#1529
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fixup slightly safer
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683ee85 Introduced behavior that can cause issues when unloading plugins.
In particular, the following convention can be seen:
end_analysisunload_pluginsqueue_main_loop_wait_fn(_unload_pyplugins)This triggers the behavior we see in #1528 and results in a SEGFAULT, but the primary issue is more fundamental.
In particular, we are removing the main_loop_wait callback before we're really done with it.