fix missing increment of the reference count on every call to startup() #3100
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also change how the implicit startup is tracked.
The extra change is needed since the startup() calls in
srt::CUDT::socket()
and
srt::CUDT::createGroup
would endlessly increment the startup counter as sockets were created.
This also adds handling for the case where the user code fails to call
srt_startup when initially using the library, but does later on.
It better matches up the implicit startup() with an implicit cleanup().
fixes #3098