[core] Increased CUnitQueue block allocation speed.

Allocates 128 additional units at the start and every time 90% of units are taken.
Previously was allocating only 32 units.

srtcore/api.cpp

@@ -2983,7 +2983,7 @@ void srt::CUDTUnited::updateMux(CUDTSocket* s, const sockaddr_any& addr, const U
         m.m_pSndQueue = new CSndQueue;
         m.m_pSndQueue->init(m.m_pChannel, m.m_pTimer);
         m.m_pRcvQueue = new CRcvQueue;
-        m.m_pRcvQueue->init(32, s->core().maxPayloadSize(), m.m_iIPversion, 1024, m.m_pChannel, m.m_pTimer);
+        m.m_pRcvQueue->init(128, s->core().maxPayloadSize(), m.m_iIPversion, 1024, m.m_pChannel, m.m_pTimer);
 
         // Rewrite the port here, as it might be only known upon return
         // from CChannel::open.