Remove instances in libssl of the constant 28 (for size of IPv4 header + UDP)
and instead use the value provided by the underlying BIO. Also provide some new DTLS_CTRLs so that the library user can set the mtu without needing to know this constant. These new DTLS_CTRLs provide the capability to set the link level mtu to be used (i.e. including this IP/UDP overhead). The previous DTLS_CTRLs required the library user to subtract this overhead first. Reviewed-by: Tim Hudson <tjh@openssl.org> (cherry picked from commit 59669b6a) Conflicts: ssl/d1_both.c ssl/ssl.h ssl/ssl_lib.c
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bbfdd1f0
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