Fix misdisplay of PNG paletted images
Problem reported by Roland Winkler (Bug#37153). Derived from a patch suggested by YAMAMOTO Mitsuharu (Bug#37153#62). * src/image.c (png_get_valid) [WINDOWSNT]: Do not dynamically link this function. (png_get_tRNS) [WINDOWSNT && PNG_tRNS_SUPPORTED]: Dynamically link this function instead. (png_load_body): Do not assume that every paletted image supplies only transparency data. Fix typo in use of transparent_p.
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