Remove checks that were making defines that weren't used. #51
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For instance
HAVE_FCNTL_H
is never checked for in the codeThis speeds up cmake configuration on my machine by ~25% to ~30%
Before: 1.76user 0.61system 0:02.35elapsed 100%CPU (0avgtext+0avgdata 22996maxresident)k
After: 1.14user 0.34system 0:01.45elapsed 102%CPU (0avgtext+0avgdata 23056maxresident)k