[Libguestfs] missing symbol

[Hilko Bengen]

* Hilko Bengen:

> when pushing libguestfs 1.27.53 (1:1.27.53-1) through my build setup
> befor uploading it to Debian, I noticed that
> "guestfs_internal_lstatlist at Base", a symbol that has been there since
> 1.20, is now missing. This causes dpkg-gensymbols(1) whose job it is to
> compare the symbols from the newly-built libraries to the known state
> to fail.

I have now solved that problem by marking the guestfs_internal_*
functions as optional in the .symbols file.

Cheers,
-Hilko