ext/gd: conflicting iconv_t typedef breaking the Solaris build.#22810
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The gd 2.4 sync guarded gdkanji.c's 'typedef void *iconv_t' fallback with HAVE_ICONV_T_DEF, which the bundled build never defined. On Solaris <iconv.h> declares iconv_t as a struct pointer, so it clashed. Define HAVE_ICONV_T_DEF when <iconv.h> already provides iconv_t.
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The gd 2.4 sync guarded gdkanji.c's 'typedef void *iconv_t' fallback with HAVE_ICONV_T_DEF, which the bundled build never defined. On Solaris <iconv.h> declares iconv_t as a struct pointer, so it clashed. Define HAVE_ICONV_T_DEF when <iconv.h> already provides iconv_t.