[fusl] Remove LFS64 macro

fusl/src/fcntl/open.c

 #include <fcntl.h>
 #include <stdarg.h>
 #include "syscall.h"
 #include "libc.h"
 
 int open(const char* filename, int flags, ...) {
   mode_t mode = 0;
 
   if ((flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE) {
     va_list ap;
     va_start(ap, flags);
     mode = va_arg(ap, mode_t);
     va_end(ap);
   }
 
   int fd = __sys_open_cp(filename, flags, mode);
   if (fd >= 0 && (flags & O_CLOEXEC))
     __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
 
   return __syscall_ret(fd);
 }
-
-LFS64(open);