Upgrade to serial AM2. (AM_ICONV): Renamed from jm_ICONV; all uses changed. Add --with-libconv-prefix. Quote first arg of AC_DEFUN. Add description for ICONV_CONST. (am_cv_func_iconv): Renamed from jm_cv_func_iconv. (am_cv_lib_iconv): Renamed from jm_cv_lib_iconv. (am_cv_proto_iconv): Renamed from jm_cv_proto_iconv.