system: move _T to compat

...where it belongs.

Signed-off-by: Simon Rozman <simon@rozman.si>

include/stdex/compat.hpp

@@ -159,6 +159,9 @@
 #define __L(x) L ## x
 #define _L(x)  __L(x)
 #endif
+#ifndef _T
+#define _T(x) x
+#endif
 
 #ifndef _Likely_
 #if _HAS_CXX20

include/stdex/system.hpp

@@ -62,7 +62,6 @@ namespace stdex
 	using schar_t = TCHAR;
 #else
 	using schar_t = char;
-#define _T(x) x
 #endif
 
 	///