optional build options to use Bounds-checking functions

[outscale-mgo]

Bounds-checking functions are C11, but as they are part of libc, they are not in the compiler.
that mean, that supporting those can be harder than supporting C11 keyword.
as osc-sdk-c is meant to be include inside the source, a way to use thoses function, would be at compile time using something like -DBOUND_CHK_C11=1;