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Close the channel when an "unexpected event" error occurs. Indeed, we take the risk of leaving the channel out of the main loop in this case because of the "return FALSE", so this channel becomes useless.

- due to missing TargetConditionals.h inclusion, the ios build was compiling the mac implementation. Don't know if it works on iOS.
- fix memory leak.

fix(BodyHandler): belle_sip_multipart_body_handler_new_from_buffer use now a const void* parameter instead of void* (buffer is not modified after all)

The test was incorrect since it was executing before last services were stoppped

do not fix the issue
This reverts commit a029446d.