libfishsound build failure on s390x

[Martin Steghöfer]

Petter Reinholdtsen wrote:
> There is a test failure for libfishsound on s390x.  No idea why. It
> will block the new version from entering testing and Jessie.

Ron wrote:
> I'm going to put my early bet on these having something to do with
> it:
>
> flac.c: In function 'fs_flac_decode_header':
> flac.c:253:8: warning: passing argument 2 of 'FLAC__stream_decoder_init_stream' from incompatible pointer type
>          fs_flac_read_callback,
>
> flac.c: In function 'fs_flac_enc_headers':
> flac.c:598:8: warning: passing argument 2 of 'FLAC__stream_encoder_init_stream' from incompatible pointer type
>          fs_flac_enc_write_callback,
>
> Which without looking at the code is probably a mismatch of some
> parameter type.

Let's see, if he wins his bet :-)

I fixed the incompatible types problem in 5271b1fb. Petter, do you have 
a way to test the build on s390 before actually resubmitting the package?

Cheers,
Martin