THRIFT-1880 Make named pipes server work asynchronously (overlapped) to allow for clean server stops

Patch: Jens Geyer
diff --git a/lib/delphi/src/Thrift.Transport.Pipes.pas b/lib/delphi/src/Thrift.Transport.Pipes.pas
index 54e00a4..bf07e1e 100644
--- a/lib/delphi/src/Thrift.Transport.Pipes.pas
+++ b/lib/delphi/src/Thrift.Transport.Pipes.pas
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