Update srt from 1.3.4 (from SP2) to 1.5.3, which includes tons
of fixes and allows to simplify the gstreamer packaging
(jsc#PED-6566)

- version update to 1.5.3
  * New Features
    - PR #2714: Added maximum BW limit for retransmissions. See SRTO_MAXREXMITBW.
  * Important Bug Fixes
    - PR #2632: Use overlapped WSASendTo to avoid UDP sending losses.
    - PR #2766: Fixed spurious group read-ready epoll events.
    - PR #2772: Fixed RCV buffer initialization in Rendezvous. ⚠️
    - PR #2757: Fix memory leak on queuing connection initialization packets.
    - PR #2745: Fix hang up on not enough space in the RCV buffer.
    - PR #2740: Fix possible tsbpd() deadlock with processCtrlShutdown().
    - PR #2692: Rejection not undertaken in rendezvous after KMX failure.
    - PR #2774: Fix rendezvous connection mode when processing resulted in ACCEPT it was still sending rejection.
    - PR #2778: Drop unencrypted packets in AES-GCM mode.
  * Build
    - PR #2779, #2780: Fix the build for targets without IP_ADD_SOURCE_MEMBERSHIP.
    - PR #2784: Added missing public header files in Windows binary installer.
  * Unit Tests
    - PR #2681: Added custom main with transparent parameters.
  * Documentation
    - PR #2765: Updated the explicit information for binding to IPv6 wildcard.
    - PR #2785: Fixed API doc: SRT_INVALID_SOCK
  * https://github.com/Haivision/srt/releases/tag/v1.5.3

- Update to 1.5.2: 
  * API
    - 41c4b1f Fixed #ifdef ENABLE_AEAD_API_PREVIEW (#2603).
    - b3a21e1 SRT version raised to 1.5.2.
    - c0d9fcd Restored resetlogfa(..) in udt.h. Reverting #2558, although udt.h is not the official SRT API.
    - 87de405 Added ENABLE_AEAD_API_PREVIEW build option to enable AEAD API.
    - 60d1237 Crypto mode 'auto' implemented for listener (#2574).

• Files Changed
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