preallocate CPU usage - pre4

[Rob Bosch]

I took a stab at modifying the preallocate.diff patch file replacing it with
ftruncate (attached).  Do you think the file looks OK for Linux (obviously
cygwin should use posix_fallocate)?  I replaced posix_fallocate with
ftruncate and also removed the check for HAVE_POSIX_FALLOCATE. 

Maybe this should be preallocate-linux.diff? 

Rob
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