message: [CI] Fix llvm-toolchain dependency
diff: @@ -67,7 +67,6 @@ matrix:
  before_install:
  - sudo apt-get update
  - sudo apt-get purge g++
  - - sudo apt-get install g++-6
  - sudo apt-get install clang-3.9
  - CC=clang-3.9 && CXX=clang++-3.9
  addons:
  @@ -84,14 +83,12 @@ matrix:
  before_install:
  - sudo apt-get update
  - sudo apt-get purge g++
  - - sudo apt-get install g++-6
  - sudo apt-get install clang-4.0
  - CC=clang-4.0 && CXX=clang++-4.0
  addons:
  apt:
  sources:
  - ubuntu-toolchain-r-test
  - - llvm-toolchain-trusty-4.0
  packages:
  - ninja-build
  - xorg-dev
  @@ -102,14 +99,12 @@ matrix:
  before_install:
  - sudo apt-get update
  - sudo apt-get purge g++
  - - sudo apt-get install g++-6
  - sudo apt-get install clang-5.0
  - CC=clang-5.0 && CXX=clang++-5.0
  addons:
  apt:
  sources:
  - ubuntu-toolchain-r-test
  - - llvm-toolchain-trusty-5.0
  packages:
  - ninja-build
  - xorg-dev
  @@ -120,14 +115,12 @@ matrix:
  before_install:
  - sudo apt-get update
  - sudo apt-get purge g++
  - - sudo apt-get install g++-6
  - sudo apt-get install clang-6.0
  - CC=clang-6.0 && CXX=clang++-6.0
  addons:
  apt:
  sources:
  - ubuntu-toolchain-r-test
  - - llvm-toolchain-trusty-6.0
  packages:
  - ninja-build
  - xorg-dev
  