os2: make platform error more ergonomic by making it an alias

core/os/os2/errors_windows.odin

@@ -5,6 +5,8 @@ import "base:runtime"
 import "core:slice"
 import win32 "core:sys/windows"
 
+_Platform_Error :: win32.System_Error
+
 _error_string :: proc(errno: i32) -> string {
 	e := win32.DWORD(errno)
 	if e == 0 {
@@ -68,4 +70,4 @@ _get_platform_error :: proc() -> Error {
 		// fallthrough
 	}
 	return Platform_Error(err)
-}
+}