将win下的char8定义改到DataTypeWin.h，保持与gnu编译器一致

inc/hgl/platform/compiler/DataTypeWin.h

@@ -13,5 +13,12 @@ namespace hgl
 
     using float32   =float;
     using float64   =double;
+    
+    #if defined(__cpp_char8_t)||defined(__cpp_lib_char8_t)
+        #define HGL_SUPPORT_CHAR8_T
+        using u8char    =char8_t;
+    #else
+        using u8char    =char;
+    #endif
 }//namespace hgl
 #endif//HGL_DATATYPE_WINDOWS_INCLUDE

inc/hgl/platform/compiler/Microsoft.h

@@ -20,13 +20,6 @@
 
 #define HGL_THREAD_LOCAL_STORAGE        __declspec(thread)                              //线程本地储存
 //--------------------------------------------------------------------------------------------------
-#if _MSVC_LANG>=201704L         //C++20
-    #define HGL_SUPPORT_CHAR8_T
-    using u8char    =char8_t;
-#else
-    using u8char    =char;
-#endif
-
 #define HGL_FMT_I64            "%I64d"
 #define HGL_FMT_U64            "%I64u"
 //参考文档最后查阅支持版本为VC2013，网址：http://msdn.microsoft.com/en-us/library/tcxf1dw6.aspx