Fix CMake 2.8.12 warnings
Fix CMake 2.8.12 warnings

hernando/vmmlib,biddisco/CMake,rballester/vmmlib,jafyvilla/CMake,biddisco/CMake,jafyvilla/CMake,rballester/vmmlib,shurikasa/CMake,biddisco/CMake,shuaibarshad/KAUST-CMake,shurikasa/CMake,hernando/vmmlib,biddisco/CMake,jafyvilla/CMake,ptoharia/CMake,shuaibarshad/KAUST-CMake,shuaibarshad/KAUST-CMake,tribal-tec/vmmlib,ptoharia/CMake,ptoharia/CMake,hernando/vmmlib,shuaibarshad/KAUST-CMake,jafyvilla/CMake,rballester/vmmlib,shurikasa/CMake,ptoharia/CMake,shurikasa/CMake