libsndfile: security bump to version 1.0.28

libsndfile: security bump to version 1.0.28

Fixes:

CVE-2017-7585 - In libsndfile before 1.0.28, an error in the
"flac_buffer_copy()" function (flac.c) can be exploited to cause a
stack-based buffer overflow via a specially crafted FLAC file.

CVE-2017-7586 - In libsndfile before 1.0.28, an error in the "header_read()"
function (common.c) when handling ID3 tags can be exploited to cause a
stack-based buffer overflow via a specially crafted FLAC file.

CVE-2017-7741 - In libsndfile before 1.0.28, an error in the
"flac_buffer_copy()" function (flac.c) can be exploited to cause a
segmentation violation (with write memory access) via a specially crafted
FLAC file during a resample attempt, a similar issue to CVE-2017-7585.

CVE-2017-7742 - In libsndfile before 1.0.28, an error in the
"flac_buffer_copy()" function (flac.c) can be exploited to cause a
segmentation violation (with read memory access) via a specially crafted
FLAC file during a resample attempt, a similar issue to CVE-2017-7585.

Dop undocumented patch adjusting SUBDIRS in Makefile.in as it no longer
applies.  Instead pass --disable-full-suite to disable man pages,
documentation and programs, as that was presumably the reason for the patch.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>