Hard minimum compiler version GCC 4.8 and Clang 3.4 (#3587)
Hard minimum compiler version GCC 4.8 and Clang 3.4 (#3587)

Fixes #3155.
nounoursheureux/MCServer,mc-server/MCServer,Altenius/cuberite,mc-server/MCServer,Altenius/cuberite,johnsoch/cuberite,johnsoch/cuberite,mc-server/MCServer,Altenius/cuberite,mc-server/MCServer,nounoursheureux/MCServer,nounoursheureux/MCServer,Altenius/cuberite,nounoursheureux/MCServer,johnsoch/cuberite,Altenius/cuberite,johnsoch/cuberite,nounoursheureux/MCServer,mc-server/MCServer,johnsoch/cuberite,mc-server/MCServer,nounoursheureux/MCServer