Check wether CRYPT_RANDOM_IS_WINDOWS is defined before defining it.
Fixed coding style to comply with other not defined statements
Merge pull request #162 from FrenkyNet/master

Check wether CRYPT_RANDOM_IS_WINDOWS is defined before defining it.

* FrenkyNet/master:
  Fixed coding style to comply with other not defined statements
  Check wether CRYPT_RANDOM_IS_WINDOWS is defined before defining it.