[aur-general] delete mingw-w64-libpng-static

Hi, Please delete: https://aur.archlinux.org/packages/mingw-w64-libpng-static/ as static libs are provided by mingw-w64-libpng xantares@archlinux:~$ pacman -Ql mingw-w64-libpng mingw-w64-libpng /usr/ mingw-w64-libpng /usr/i686-w64-mingw32/ ... mingw-w64-libpng /usr/i686-w64-mingw32/lib/ ... mingw-w64-libpng /usr/i686-w64-mingw32/lib/libpng.a ... mingw-w64-libpng /usr/i686-w64-mingw32/lib/libpng16.a xan.