GCC 4.9 / Visual Studio 2015 End Of Life

[Aokromes 607]

Since we are targeting C++14 compilers, GCC 4.9 and Visual Studio 2015 will become unsupported 1 month after the release of Debian 9.

We give this warning to allow people to ready their systems with enough time to update (it's very likely Debian 9 will be shipped on 2nd quarter 2017).

(Visual Studio 2017 release date is March 7)

[Aokromes 607]

Debian 9 released we recommend to update before 1 month or you very likely will have compile broken if  you still use gcc to compile.