By Ilona Wissenbach and Jan Schwartz MUNICH (Reuters) – The EU deal to phase out combustion engine cars in just over 12 years is challenging, but a more daunting obstacle will be making enough batteries to power the electric cars needed as a result, a senior Volkswagen executive said on Wednesday. The comment was made after European Union countries clinched deals on proposed laws to combat climate change early on Wednesday, including one requiring new cars sold in the bloc to emit zero CO2 from 2035. That would make it impossible to sell internal-combustion engine cars. The European Commission…