[core] Fixed getting SRTO_RCVBUF and SRTO_SNDBUF on a group. #3077
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The documented length is 4 bytes, the code was setting 8 bytes without checking `optlen`.
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The documented length of
SRTO_RCVBUFandSRTO_SNDBUFsocket options is 4 bytes, the code was setting 8 bytes without checkingoptlen. Hence producing an out-of-bound memory write.Introduced since the start by PR #1109.
Affected SRT versions: v1.4.2+.
Work within issue #3074.