maintainer-feedback requested: [Bug 240954] converters/libiconv: update to 1.16

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Bug 240954: converters/libiconv: update to 1.16
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240954



--- Description ---
libiconv-1.16 has been released since April. 26, 2019.
Our libiconv port has Japanese specific patch which seems
discontinued updating for a long time.
It's time to obsolete the discontinued patch and update libiconv.

The `libiconv-1.16.patch` updates converters/libiconv port.
I have fixed portlint warnings, too.

For people who really want to use the Japanese specific patch,
I suggest to move libiconv 1.14 to japanese/libiconv114 and
switch to use japanese/libiconv114 via
`portmaster -o japanese/libiconv114 converters/libiconv` and
`pkg set -o converters/libiconv:japanese/libiconv114`.

The `libiconv114.patch` creates japanese/libiconv114 port.

Please apply two patches and announce following message in UPDATING text.

```
AFFECTS: users of converters/libiconv with PATCHES option

Japanese specific patch has been obsoleted.
Because it seems discontinued updating for a long time.
Users who really want to use the patch,
Please switch to use japanese/libiconv114 port.

  portmaster -o japanese/libiconv114 converters/libiconv
  pkg set -o converters/libiconv:japanese/libiconv114
```