Fix bug #17790 with compilation against giflib 5.1.0 and later.
src/image.c [5 < GIFLIB_MAJOR + (1 <= GIFLIB_MINOR)]: Declare the prototype of DGifCloseFile as appropriate for older and newer versions of giflib. (gif_close): New function, encapsulates the differences in the calling sequence of DGifCloseFile before v5.1.0 and after it. (gif_load): Call gif_close instead of DGifCloseFile. Divulge the error string where appropriate. lisp/term/w32-win.el (dynamic-library-alist): Support giflib 5.1.0 and later.
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