Don't use $<COMPILE_LANGUAGE:CXX> to add PYBIND11_CPP_STANDARD for VS CMake generators

Author: YannickJadoul

tools/pybind11Tools.cmake

@@ -217,7 +217,7 @@ function(pybind11_add_module target_name)
 
   # Make sure C++11/14 are enabled
   if(PYBIND11_CPP_STANDARD)
-    if(CMAKE_VERSION VERSION_LESS 3.3)
+    if(CMAKE_VERSION VERSION_LESS 3.3 OR CMAKE_GENERATOR MATCHES "Visual Studio")
       target_compile_options(${target_name} PUBLIC ${PYBIND11_CPP_STANDARD})
     else()
       target_compile_options(${target_name} PUBLIC $<$<COMPILE_LANGUAGE:CXX>:${PYBIND11_CPP_STANDARD}>)