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- check libiconv with a linkage test with iconv.h included - check libc iconv with a linkage test with iconv.h included and LIBICONV_PLUG defined (in case libiconv header is in include path) - add new configuration option to prefer iconv from libiconv, if available, over the libc version, defaults to disabled: SDL_LIBICONV for cmake, --enable-libiconv for autotools. - change FreeBSD specific LIBICONV_PLUG define in SDL_iconv.c to configuration result.