iconv

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Add JRuby's iconv ext.

1

I picked https://github.com/ruby/iconv/pull/7 and fixed conflict.

hsbt

Fails to build on ruby 3.3 with clang-1500.3.9.4

2

Given the last command line tools update on MacOS with a M1 iconv no longer builds. Excerpt from the log: ``` iconv.c:709:50: error: incompatible function pointer types passing 'VALUE (VALUE,...

joeljunstrom