[dart:io] - Fix incorrect setting of socket options for UNIX-DOMAIN sockets - setting of UNIX-DOMAIN socket options was not throwing the correct error - listen in HTTPServer was trying to set TCP_NODELAY for UNIX-DOMAIN sockets Fixes : https://github.com/dart-lang/sdk/issues/45977 https://github.com/dart-lang/sdk/pull/45978 https://github.com/dart-lang/sdk/issues/45975 TEST=new test cases added Change-Id: Ie0341f26b1ba0f9423c08a8de968053a2af1c730 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/199640 Commit-Queue: Siva Annamalai <asiva@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
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