pipeline buffering

[jedge <d1m_bu1b () yahoo com>]

When using the (-w) option in conjunction with the (-l) option, sending the binary network packets to stdout still 
buffers.
I am using tcpdump and all its glorious features as a front end filter to a similar process that handles the 
presentation layer.

I modified tcpdump.c near lines 822 (-i) and 956 (-w) to detect the need to flush stdout when utilizing the pipeline by 
adding
setvbuf(stdout, NULL, _IONBF, 0);
This allows my application to process and display the  presentation layer as they come in, while still being able to do 
things such as
tcpdump -w - | tee <fileName> | <downstreamApp>


Hopefully this helps somebody.

Team,
Please consider adding this feature to the baseline.
Respectfully,
Bubbah
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