* image.c: Fix animation cache signature memory leak.
Fix some other minor performance problems while we're at it. (imagemagick_create_cache): Clear just the members that need clearing. Don't set update_time, as caller does that now. (imagemagick_prune_animation_cache, imagemagick_get_animation_cache): Simplify by using pointer-to-pointer instead of a prev pointer. (imagemagick_prune_animation_cache): Use make_emacs_time rather than EMACS_TIME_FROM_DOUBLE, and DestroyString rather than free. (imagemagick_get_animation_cache): Don't xstrdup the image signature; it's already a copy. Free the signature probe unless it's cached.
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