res_pjsip_pubsub: Prevent removing subscriptions.
pjproject does not provide any mechanism of removing event packages, which means that once a subscription handler is registered, it is effectively permanent. pjproject will assert if the same event package is ever registered again, so currently unloading and loading any Asterisk modules that use subscriptions will cause a crash that is beyond our control. For that reason, we now prevent users from being able to unload these modules, to prevent them from ever being loaded twice. ASTERISK-30264 #close Change-Id: I7fdcb1a5e44d38b7ba10c44259fe98f0ae9bc12c
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