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Saves 2 bytes or 2F in
unsigned long random(void). Also adds autotests forrandom,srandom,rand, andsrand. The purpose of the autotests is for catching bugs when the change in output was not intended. If we changerandom/randto a different algorithm, then you just need to regenerate the tests by settingGENERATE_TESTSto 1 in themain.cfile.