when compiling i have this warning: OpenGL_GL_PREFERENCE has not been…

… set to "GLVND" or "LEGACY", so for compatibility with CMake 3.10 and below the legacy GL library will be used.

Policy CMP0072 says that I need to set OpenGL_GL_PREFERENCE to LEGACY.

CMakeLists.txt

@@ -22,6 +22,8 @@ if(CMAKE_VS_PLATFORM_NAME STREQUAL "Tegra-Android")
 	set(CMAKE_LINK_LIBRARY_FLAG "")
 endif()
 
+#fix Policy CMP0072 is not set
+set(OpenGL_GL_PREFERENCE LEGACY)
 
 # Use relative paths
 # This is mostly to reduce path size for command-line limits on windows