Fix MSVC _*snprintf() incompatibility
Fix MSVC _*snprintf() incompatibility

The functions snprintf() and _snprintf() are **not** the same.
See http://stackoverflow.com/questions/27754492 .

However, since we now support only MSVC 14 and on, and it defines the
C99 library functions including these ones, we don't need these
definitions any more.

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