Remove cmake warning about policy change

Author: Mayeul d'Avezac

scripts/CheckCXX11Features.cmake

@@ -118,7 +118,8 @@ function(parse_input_features ALLFEATURES OPTIONALS REQUIRED ERRORS)
     set(UNKNOWN_FEATURES)
     set(result_type OPTIONAL_FEATURES)
     foreach(feature ${ARGN})
-      if(${feature} STREQUAL "REQUIRED")
+      string(COMPARE EQUAL "${feature}" "REQUIRED" avoid_cmake_warning)
+      if(avoid_cmake_warning)
         set(result_type REQUIRED_FEATURES)
       else()
         list(FIND ALLFEATURES ${feature} feature_was_found)
@@ -128,8 +129,7 @@ function(parse_input_features ALLFEATURES OPTIONALS REQUIRED ERRORS)
         else()
           list(APPEND ${result_type} ${feature})
         endif()
-
-      endif(${feature} STREQUAL "REQUIRED")
+      endif()
     endforeach()
 
     set(${OPTIONALS} ${OPTIONAL_FEATURES} PARENT_SCOPE)