Remove redundant CMake version check

Author: ChrisThrasher

CMakeLists.txt

@@ -54,7 +54,7 @@ set(IMGUI_PUBLIC_HEADERS
 # CMake 3.11 and later prefer to choose GLVND, but we choose legacy OpenGL just because it's safer
 # (unless the OpenGL_GL_PREFERENCE was explicitly set)
 # See CMP0072 for more details (cmake --help-policy CMP0072)
-if((NOT ${CMAKE_VERSION} VERSION_LESS 3.11) AND (NOT OpenGL_GL_PREFERENCE))
+if(NOT OpenGL_GL_PREFERENCE)
   set(OpenGL_GL_PREFERENCE "LEGACY")
 endif()