Add cmake to CI container
[ci skip]
FROM ubuntu:16.04
MAINTAINER Jeff Bush (https://github.com/jbush001)
-RUN apt-get update && apt-get install -y make gcc g++ python3 perl libsdl2-dev imagemagick git
+RUN apt-get update && apt-get install -y make gcc g++ python3 perl libsdl2-dev imagemagick git cmake
ADD tmp/clang-5.0 /usr/local/llvm-nyuzi/bin/
ADD tmp/elf2hex /usr/local/llvm-nyuzi/bin/
ADD tmp/lld /usr/local/llvm-nyuzi/bin/
