Andrew Kelley 29b488245d add setFloatMode builtin and std.math.floor ...

* skip installing std/rand_test.zig as it's not needed beyond running
   the std lib tests
 * add std.math.floor function
 * add setFloatMode builtin function to choose between
   builtin.FloatMode.Optimized (default) and builtin.FloatMode.Strict
   (Optimized is equivalent to -ffast-math in gcc)

2017-05-20 23:06:32 -04:00

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