Bump min cmake version to 3.5

Author: bukka

CMakeLists.txt

@@ -38,7 +38,7 @@ IF(BIICODE)
 	  ENDIF()
 	ENDIF()
 ELSE()
-cmake_minimum_required (VERSION 2.8)
+cmake_minimum_required (VERSION 3.5)
 
 if (NOT DEFINED CMAKE_BUILD_TYPE)
     set (CMAKE_BUILD_TYPE Release CACHE STRING "Build type")