Revert "Added a BasicStyleCheck for virtual functions without override keyword."
Revert "Added a BasicStyleCheck for virtual functions without override keyword."

This reverts commit a800b5bd9f663b5c7d78101a449f97e5a5789c9a.

nounoursheureux/MCServer,mc-server/MCServer,kevinr/cuberite,nounoursheureux/MCServer,nounoursheureux/MCServer,kevinr/cuberite,nounoursheureux/MCServer,johnsoch/cuberite,kevinr/cuberite,Frownigami1/cuberite,mc-server/MCServer,Frownigami1/cuberite,johnsoch/cuberite,mc-server/MCServer,kevinr/cuberite,johnsoch/cuberite,johnsoch/cuberite,johnsoch/cuberite,kevinr/cuberite,Altenius/cuberite,Altenius/cuberite,Frownigami1/cuberite,Frownigami1/cuberite,nounoursheureux/MCServer,Altenius/cuberite,mc-server/MCServer,Altenius/cuberite,Altenius/cuberite,kevinr/cuberite,Frownigami1/cuberite,nounoursheureux/MCServer,mc-server/MCServer,mc-server/MCServer