Add option to set NaN not equal NaN for floating point assertions #226
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This PR adds an option to change the default NaN comparison. NaN != NaN in C code (NaN is not equal to any value, not even itself). As such, one might want a failure during
TEST_ASSERT_EQUAL_FLOAT(NaN, NaN).Compile with
UNITY_NAN_NOT_EQUAL_NANdefined to enable this option.