[mlpack-git] [mlpack/mlpack] Test had stuck in 2.0.2 (#718)

[Li Dong]

I debugged the above small testing code on Armadillo, and use `lldb` to see which part causes the problem. Then I found the following infinite loop in `random.tcc` bared in `libstdc++`:

```
   1798		    do
   1799		      {
   1800			__x = result_type(2.0) * __aurng() - 1.0;
-> 1801			__y = result_type(2.0) * __aurng() - 1.0;
   1802			__r2 = __x * __x + __y * __y;
   1803		      }
   1804		    while (__r2 > 1.0 || __r2 == 0.0);
(lldb)
```

where `__x` and `__y` are always -1, so `__r2` is always 2.

BTW, I am using GCC 6.1.0 compiled by myself, so it is the problem of `libstdc++`? Sorry, it is not related to MLPACK actually.

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