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Fix #382 - MinGW often reports negative CPU times. (#475)

When stopping a timer, the current time is subtracted
from the start time. However, when the times are identical,
or sufficiently close together, the subtraction can result
in a negative number.

For some reason MinGW is the only platform where this problem
manifests. I suspect it's due to MinGW specific behavior in either
the CPU timing code, floating point model, or printf formatting.

Either way, the fix for MinGW should be correct across all platforms.

1 of 1 new or added line in 1 file covered. (100.0%)

1415 of 1624 relevant lines covered (87.13%)

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