Revert "build: disable iconv by default."

This reverts commit 9ad3cd5b5f848eb3cd033be515d34296f099148b.

The misdetection on OS X should be fixed, we will only get
problem reports if auto-detection is enabled.
(cherry picked from commit 3f78f0904bfa012b171cecfae87af7c6909c8ede)
mpegts: clear avprograms only for removed programs

Fixes Ticket2186

Requested-by: carl
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 806a66fd08a395486e763fb10588c5fd02e8d54e)
jpegdec: be less picky on padding

Fixes Ticket2353

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 3c24fbbf651d4ec28eccfd7ef05a2595a11dd55a)
Changelog: update version

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
release_notes: update

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
mem: Fix usage of memalign() on DJGPP.

Credits to Khusraw of bttr-software.de forum.
Signed-off-by: Carl Eugen Hoyos <cehoyos@ag.or.at>
(cherry picked from commit 91b747ac78218805a79435f50587f87167569dad)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>