C++11: __STDC_HOSTED__ Macro

If __STDC_HOSTED__ is defined as 1 by the compiler, then the all of the C standard library facilities are available.

Reference: https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html

                    https://isocpp.org/wiki/faq/cpp11-language-misc#cpp11-c99