try fixing compilation tests for MSVC

Author: nmm0

compilation_tests/CMakeLists.txt

@@ -4,6 +4,7 @@ macro(add_compilation_test name)
     set_source_files_properties(${name} PROPERTIES LANGUAGE ${MDSPAN_TEST_LANGUAGE})
   endif()
   add_executable(${name} ${name}.cpp)
+  target_compile_features(${name} PRIVATE cxx_std_17)
   target_link_libraries(${name} mdspan)
 endmacro()