update `on_test` languages version (#1494)

packages/f/fmt/xmake.lua

@@ -57,6 +57,6 @@ package("fmt")
                 std::string s = fmt::format("{}", "hello");
                 assert(s == "hello");
             }
-        ]]}, {configs = {languages = "c++11"}, includes = "fmt/format.h"}))
+        ]]}, {configs = {languages = "c++14"}, includes = "fmt/format.h"}))
     end)
 

packages/s/spdlog/xmake.lua

@@ -54,5 +54,5 @@ package("spdlog")
     end)
 
     on_test(function (package)
-        assert(package:has_cxxfuncs("spdlog::info(\"\")", {includes = "spdlog/spdlog.h", configs = {languages = "c++11"}}))
+        assert(package:has_cxxfuncs("spdlog::info(\"\")", {includes = "spdlog/spdlog.h", configs = {languages = "c++14"}}))
     end)

packages/v/vulkan-hpp/xmake.lua

@@ -48,5 +48,5 @@ package("vulkan-hpp")
                 ai.engineVersion = VK_MAKE_API_VERSION(1,0,0,0);
                 ai.apiVersion = VK_API_VERSION_1_0;
             }
-        ]]}, {includes = "vulkan/vulkan.hpp", configs = {languages = "c++11"} }))
+        ]]}, {includes = "vulkan/vulkan.hpp", configs = {languages = "c++14"} }))
     end)