[v3] AM_ICONV to native-only

[Benjamin Kosnik]

Thanks to Gaby, I was finally able to reproduce this issue by using 
powerpc-eabi as the target and removing --with-newlib flags.

I am unsure as to reasons behind the variance in configure behavior 
between powerpc-eabi, arm-elf, and m32c-elf, with and without 
--with-newlib flags. Some work without this change, some do not.

However, the enclosed patch fixes the configure fail in all cases, by 
moving AM_ICONV to native only.

tested x86/linux
tested x86/linux x powerpc-eabi (without --with-newlib)

-benjamin


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