converters/libiconv: update to 1.18

[rodrigo]

Summary

Changelog: https://savannah.gnu.org/news/?id=10703

Test Plan

Successfully run libiconv tests (https://git.savannah.gnu.org/gitweb/?p=libiconv.git;a=tree;f=tests;h=3139efc00834722f8fab375831ea1149fca8a000;hb=HEAD)

[fluffy]

It breaks print/texinfo (or, at least, devel/p5-Locale-libintl produces bad code)

[rodrigo]

In D48179#1099074, @fluffy wrote:

It breaks print/texinfo (or, at least, devel/p5-Locale-libintl produces bad code)

Yes you are right, when reporting the patches I break the iconv.h include file. It's now fixed and I start performing a whole build of the packages who depends on iconv to see if other ports are affected by my changes. Spoiler.... yes.
I will push my changes once I finish the wipe up :p

[rodrigo]

Fix include file patch

[fluffy]

Got latest patch, got more errors with

ld: error: undefined symbol: libiconv_open
>>> referenced by charset-map.c
>>>               charset-map.o:(main)
>>> referenced by charset-map.c
>>>               charset-map.o:(main)

ld: error: undefined symbol: libiconv
>>> referenced by charset-map.c
>>>               charset-map.o:(main)
>>> referenced by charset-map.c
>>>               charset-map.o:(main)
>>> referenced by charset-map.c
>>>               charset-map.o:(main)
>>> referenced 1 more times

ld: error: undefined symbol: libiconv_close
>>> referenced by charset-map.c
>>>               charset-map.o:(main)
>>> referenced by charset-map.c
>>>               charset-map.o:(main)
cc: error: linker command failed with exit code 1 (use -v to see invocation)

print/cups
mail/exim
mail/gmime26
mail/gmime30

[fluffy]

more failures

sysutils/cdrdao
audio/espeak-ng
math/gnuplot
graphics/graphviz
devel/indi
devel/librcc
print/libspectre
devel/sdl20
emulators/virtualbox-ose