Simplify iconv patch.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit 63ba2ccbda)

The crude loop I wrote to come up with this changeset:

  find -L package/feeds/packages/ -name patches | \
  sed 's/patches$/refresh/' | sort | xargs make

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Removed iconv const patch. After discussing with upstream. it turns out
that libiconv-full in OpenWrt is broken.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Removes liconv LDFLAG and fixes ICONV_FULL.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

pulseaudio-daemon depends on alsa-lib, which depends on @AUDIO_SUPPORT.
Enables -full on platforms lacking AUDIO_SUPPORT.

Simplified LDFLAGS slighly.

Removed pointless ICU dependency. I managed to patch meson.build to fix
iconv compilation. The original error was that without the header, it
was prefixing the iconv check with __buildin_ , which does not work
with uClibc-ng.

Signed-off-by: Rosen Penev <rosenp@gmail.com>