Remove libpng from dependencies in README.md.

Followup on 05bd2a95 and 513af13d.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>
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Rafael Kitover 2020-03-02 19:15:38 +00:00
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@ -119,7 +119,6 @@ And the following development libraries:
- [mesa](https://mesa3d.org/) (if using X11 or any OpenGL otherwise)
- [ffmpeg](https://ffmpeg.org/) (optional, at least version `4.0.4`, for game recording)
- [gettext](https://www.gnu.org/software/gettext/) and gettext-tools (optional, with ENABLE_NLS)
- [libpng](http://www.libpng.org/pub/png/libpng.html) (required)
- [SDL2](https://www.libsdl.org/) (required)
- [SFML](https://www.sfml-dev.org/) (optional, for link)
- [OpenAL](https://www.openal.org/) or [openal-soft](https://kcat.strangesoft.net/openal.html) (optional, a sound interface)