make: unifdef SUN5_0 (defined)

@@ -51,13 +51,10 @@
         struct { int mode;} mkdir;
         struct { char *name; int mode;} mount;
         struct { int flags; int mode;} open;
         struct { char *buffer; int buffer_size;} readlink;
         struct { struct stat *buffer;} stat;
-#ifndef SUN5_0
-        struct { struct statfs *buffer;} statfs;
-#endif
         struct { int length;} truncate;
         struct { struct timeval *time;} utimes;
 };
 
 extern  union Args      vroot_args;