Tests: Update CompileFeatures test for Intel 19 with VS 2015

Blacklist `cxx_relaxed_constexpr` for this case because the compiler
does not advertise the support in this mode but compiles our example.

Tests/CompileFeatures/CMakeLists.txt

@@ -130,6 +130,12 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
 endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
+  if (CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC"
+      AND CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 19.10)
+    list(REMOVE_ITEM CXX_non_features
+      cxx_relaxed_constexpr
+      )
+  endif()
   if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 16.0)
     if (CMAKE_CXX_COMIPLER_VERSION VERSION_EQUAL 15.0)
       list(REMOVE_ITEM CXX_non_features