build: Update m4/iconv.m4.
* m4/iconv.m4: Update from gettext 0.20.1.
This includes fixes of file descriptor leaks.
- GnuPG-bug-id: T4504
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
build: Update m4/iconv.m4. Tags None Subscribers None
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