WASI libc's dirent does have t_type, so define _DIRENT_HAVE_D_TYPE.

Also update predefined-macros.txt.

Author: sunfishcode

expected/wasm32-wasi/predefined-macros.txt

@@ -2079,8 +2079,6 @@
 #define _CTYPE_H 
 #define _Complex_I (0.0f+1.0fi)
 #define _DIRENT_H 
-#define _DIRENT_HAVE_D_OFF 
-#define _DIRENT_HAVE_D_RECLEN 
 #define _DIRENT_HAVE_D_TYPE 
 #define _ENDIAN_H 
 #define _ERRNO_H 

libc-bottom-half/headers/public/__struct_dirent.h

@@ -3,6 +3,8 @@
 
 #include <__typedef_ino_t.h>
 
+#define _DIRENT_HAVE_D_TYPE
+
 struct dirent {
     ino_t d_ino;
     unsigned char d_type;