Revert "Merge pull request #885 from csnover/faster-travis"

Travis builds are failing randomly after this change due to
upstream bug travis-ci/travis-ci#7103, so reverting these changes
until it is fixed.

This reverts commit 72f421cb38, reversing
changes made to c919c9996c.

.travis.yml

@@ -1,12 +1,12 @@
 language:
   - cpp
 
-sudo: false
-cache: ccache
+sudo: required
 
 addons:
   apt:
     packages:
+    - g++ make
     - libsdl2-dev
     - libsdl2-net-dev
     - libcurl4-openssl-dev