Fix GH-23272: ext/gd fails to build without the iconv extension - #23273
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gdkanji.c includes <iconv.h> only when HAVE_ICONV_H or HAVE_ICONV is set, but HAVE_ICONV_T_DEF was defined whenever <iconv.h> declares the type, dropping its fallback typedef. Detect iconv in gd's own config and define both macros together.
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gdkanji.c includes <iconv.h> only when HAVE_ICONV_H or HAVE_ICONV is set, but HAVE_ICONV_T_DEF was defined whenever <iconv.h> declares the type, dropping its fallback typedef. Detect iconv in gd's own config and define both macros together.