[Travis] Revert the last few changes; Travis still doesn't have repos for vulkan

.travis.yml

@@ -8,14 +8,13 @@ os:
   - linux
   # - osx
 
-sudo: false
+sudo: required
 dist: trusty
 addons:
   apt:
     sources:
       - ubuntu-toolchain-r-test
       - llvm-toolchain-trusty-4.0
-      - debian-sid
     packages:
       - clang-4.0
       - llvm-4.0-dev
@@ -26,8 +25,8 @@ addons:
       - libglew-dev
       - libgtk-3-dev
       - libpthread-stubs0-dev
-      - libvulkan1
-      - libvulkan-dev
+      #- libvulkan1
+      #- libvulkan-dev
       - libx11-dev
       - liblz4-dev
 
@@ -47,6 +46,10 @@ before_script:
   # Dump useful info.
   - $CXX --version
   - python3 --version
+  # Add Vulkan dependencies
+  - travis_retry wget http://mirrors.kernel.org/ubuntu/pool/universe/v/vulkan/libvulkan1_1.0.42.0+dfsg1-1ubuntu1~16.04.1_amd64.deb
+  - travis_retry wget http://mirrors.kernel.org/ubuntu/pool/universe/v/vulkan/libvulkan-dev_1.0.42.0+dfsg1-1ubuntu1~16.04.1_amd64.deb
+  - sudo dpkg -i libvulkan1_1.0.42.0+dfsg1-1ubuntu1~16.04.1_amd64.deb libvulkan-dev_1.0.42.0+dfsg1-1ubuntu1~16.04.1_amd64.deb
   # Prepare environment (pull dependencies, build tools).
   - travis_retry ./xenia-build setup