[FASTCGI] More EINTR fixes

[Artur Zaprzala]

mod_fastcgi doesn't handle all EINTR errors, which can happen when 
Apache is running in a multi-threaded mode and is keeping up with 
MaxSpareThreads or is doing a graceful restart.

Below is a patch against mod_fastcgi-SNAP-0809231057. I fixed this about 
3 years ago, so it is well tested now.


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