Fix bug #7716 with PNG image support libraries on Windows.
src/image.c <Qlibpng_version>: New variable. (syms_of_image): Intern and staticpro it. Set its value to the version of PNG library we were compiled with. (my_png_error, png_load): Avoid GCC warnings about direct access to png_ptr->jmpbuf. lisp/term/w32-win.el (image-library-alist): Set up correctly for libpng versions both before and after 1.4.0. admin/nt/README.W32: Update the information about PNG support libraries. nt/INSTALL: Update the information about PNG support libraries.
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