Deal with missing exports for hostfs

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
index 89b48a1..05f5ea8 100644
--- a/arch/um/os-Linux/user_syms.c
+++ b/arch/um/os-Linux/user_syms.c
@@ -103,6 +103,10 @@
 EXPORT_SYMBOL_PROTO(fsync);
 EXPORT_SYMBOL_PROTO(fdatasync);
 
+EXPORT_SYMBOL_PROTO(lstat64);
+EXPORT_SYMBOL_PROTO(fstat64);
+EXPORT_SYMBOL_PROTO(mknod);
+
 /* Export symbols used by GCC for the stack protector. */
 extern void __stack_smash_handler(void *) __attribute__((weak));
 EXPORT_SYMBOL(__stack_smash_handler);