[rtmpdump] Fix to compile rtmpdump v 1.9 on Mac OSX 10.6 Snow Leopard

[Howard Chu]

Tom Selgas wrote:
> To compile rtmpdump v 1.9 on Mac OSX 10.6 Snow Leopard you will need to
> do the following:
> 1) Install Xcode 3.2 from the Snow Leopard Installation DVD
> 2) Edit the "streams.cpp" file in the "rtmpdump-1.9" folder by replacing
> all (two) occurrences of "MSG_NOSIGNAL" with "SO_NOSIGPIPE".

SO_NOSIGPIPE is only valid as an option to setsockopt(), not on the send() 
system call. I've committed an alternate fix instead.

-- hyc