[FAQ] Add the answer about different binaries dependending on the linux distro

[danimtb]

There are many questions in the issues talking about collisions or differences in the compilation of binaries related to things like compiler flags or glib C.

This would worth an entry in the FAQ

conan-io/conan#2749
conan-io/conan#2911

[TManhente]

Another example of question regarding packaging for different Red Hat Enterprise Linux versions is conan-io/conan#707.