Fix CMake version check

Tools/check_cmake.sh

@@ -6,7 +6,7 @@ then
   exit 1;
 fi
 
-if [[ $cmake_ver == *"2.8"* ]] || [[ $cmake_ver == *"2.9"* ]] || [[ $cmake_ver == *"3.0"* ]] || [[ $cmake_ver == *"3.1"* ]]
+if [[ $cmake_ver == *" 2.8"* ]] || [[ $cmake_ver == *" 2.9"* ]] || [[ $cmake_ver == *" 3.0"* ]] || [[ $cmake_ver == *" 3.1"* ]]
 then
   exit 1;
 fi