windowscodecs: Autoconf macros don't always have a value.
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@ -176,7 +176,7 @@ MAKE_FUNCPTR(png_get_tRNS);
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MAKE_FUNCPTR(png_set_bgr);
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MAKE_FUNCPTR(png_set_crc_action);
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MAKE_FUNCPTR(png_set_error_fn);
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#if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
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#ifdef HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
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MAKE_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
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#else
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MAKE_FUNCPTR(png_set_gray_1_2_4_to_8);
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@ -225,7 +225,7 @@ static void *load_libpng(void)
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LOAD_FUNCPTR(png_set_bgr);
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LOAD_FUNCPTR(png_set_crc_action);
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LOAD_FUNCPTR(png_set_error_fn);
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#if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
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#ifdef HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
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LOAD_FUNCPTR(png_set_expand_gray_1_2_4_to_8);
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#else
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LOAD_FUNCPTR(png_set_gray_1_2_4_to_8);
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@ -467,7 +467,7 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
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{
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if (bit_depth < 8)
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{
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#if HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
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#ifdef HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8
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ppng_set_expand_gray_1_2_4_to_8(This->png_ptr);
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#else
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ppng_set_gray_1_2_4_to_8(This->png_ptr);
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