Made mmap-related code compatible with Cygwin #10
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The whole logic of first blocking the memory + guard page, only to overwrite it afterwards in a fixed location does not work in cygwin (startp_ gets a value of 0xffffffffffff). So created a Cygwin path and simplified the mmap to a maximum.
Didn't bother to #ifdef all references to guardp_ though, which may have been cleaner.
Testing has been limited to the benchmark files, fitting in RAM.